Priceless. You keep focusing on semantics, while missing the actual point. The difference between a "price gouger" and a "profiteer" only exists in the head of someone who wouldn't mind engaging in such a thing themselves. To the honest average Joe you are still an unethical middleman who would try to take away as much coin as you can from a person trying to buy something they desire.
Likewise, peoples' problem with you is not with your instance of getting Semlar banned, it's with you having the audacity to decide whether or not a tool/service should be available to the community. Your justification for it can be anything you want (fyi, I'm not buying your story that you really thought it would hurt the community, and I basically consider every single word you say to be a carefully manufactured lie, but that's beside the point), you were in no way elected or empowered by the community to make such a decision, and you didn't even try to get community's input on it, you just decided that you have the right to stop it because you thought your judgement here is good enough and the whole community would have to accept it.
See, this problem isn't by any means intrinsic to Warframe, it exists in every laissez faire free market, from an average bazaar to the crypto industry: random people gain wealth, and then start converting that wealth into power, gaining unelected influence over the community. In your case you did not convert wealth to power directly, but a) DE indirectly profits from your machinations, however marginally, the more plat people are having to pay for rivens, the more plat they'll be buying; and b) you rising to a position to manipulate the market made you think you can now make decisions instead of the entire community. You are not being scapegoated, you are facing a backlash for your actions. You don't have to agree with this, because your agreement is irrelevant. Human race has always viewed market manipulators as a bad thing, and has always fought back against them.
Now, the most ironic thing here is you don't really understanding the implications of what you're doing. DE has practically refused to classify your actions as hostile to the community (whether it's because they indirectly benefit from it or for any other reason, I don't know), and also shunned the people trying to dispense "mob justice" onto you (and I could also get into discussion about semantics here, on how if you "profiteering" from riven trade isn't price gouging because you're not jacking up prices of vital resources, then too, the harassment you're experiencing is neither "mob justice" nor "witch hunt", because there are no actual ropes, gallows or pyres involved, but that's also beside the point). Do you see the construct here? DE creates a system where you can do your thing, you do your thing, and then also start exercising power over community you don't deserve, community gets mad and you get backlash. Of all of these things DE addresses only the backlash part. They don't mention them being responsible for letting this happen, nor them not noticing what was happening, nor you doing it for your own gain, and only notices community backlash. I'm not judging DE here, I'm just laying this down: DE made it very clear that they would like to let you get away with what you were doing in spite of community's dismay. And barring overwhelming pressure from the community (which has already failed to materialize), DE will let you get away with zero repercussions, basically encouraging you to keep "profiteering".
And you know what? That's what was going to happen. Hell, that's still what's going to happen. Community has an attention span of a goldfish, so they'll forget that they wanted you punished, and DE won't remind them. So the smart thing for you to do would be to go away, not post, lay low, rub your palms and keep "profiteering". But no, your ego won't permit it. You have to relentlessly "damage control", replying to every post about you, because you're so sure that you're actually entitled to "profiteering" and deciding instead of the community what tools the community gets to use.
Do you see what you're doing? Because you're doing exactly what every "profiteer" has done to the system they were "profiteering" from. You continuing to brazenly highlight yourself only underscores that the regulator of this financial system (DE in this case) is not willing to punish you. And you know what that does? It decreases the community's trust in the regulator, and in the system as a whole. You're reinforcing a lasting impression on the community that trade here is rigged to enable "profiteers", and that will create a sense of unease in regular buyers. They will feel distrustful towards the people they're buying from, and towards DE. They won't be mad enough to actually revolt, but they will remember this every time they're unhappy with DE.
Sure, here you can just say that you don't have to care for the long term health of this market, and that you're technically not breaking any rules by profiteering or by being responsible for erosion of trust in the system because of your unethical practices, and you'd be right. You're not the ones that should care. DE is. And it's baffling to me that they apparently either don't care for these implications, or just don't believe in them. So.... ¯\_(ツ)_/¯ Their product, their community, their policies. If they think "profiteers" have a place in it, then all we honest members can do is choose whether or not we want to have a place in such a system.