Disclaimer: I have Dypsraxia so please try to understand that I mean this with the best intentions for the heath of the game and community within.
A single instance of "Nezha is a Trap" is a meme and shouldn't even be a block able offence anyway. Spamming is repeated content so calling a meme spam is flawed, unless the user is constantly posting the same message over and over. There have also been talk about people with anti-feminist views being hit. What again if true shouldn't be the preview of a chat filter. Unless it falls under user harassment e.g. a person was making fun of the person/user because of a political viewpoint. As anti-feminism is a topic that is discussed from time in gaming communities it seems extreme to include this in a chat filter. It be more logical to say No Politics in Region Chat, if you want to not be biased to one side. What would be a more acceptable rule. The tone of moderation decisions seems a bit aggressive, dismissive of valid criticism from users and mean.
This system comes off more that DE has it's own political echo chamber and staff are shutting down outsiders, e.g. dissenting voices and people having fun (jokes/banter). What is interesting because of a "youtube" video DE conflated personal attacks to "criticism with supported evidence". including the reaction that DE Staff where not happy when a Warframe Partner agreed there was issues. (Context being that, the WFP should have been on DE side regardless and had stepped outside the echo chamber and therefore committed a sin against DE.) What let's just say isn't good for the health of the game/community in the long run. As you appear to be persecuting one part of your community for idealogical reasons, while in (hopefully the past) enabling others (to harass, bully, threaten, ban, etc).
Side Note: Even if the ToS has a "we can ban/restrict access to the service for any reason" statement, the ACT of enforcing that position is yeah...things would escalate quickly in that case.
The main reasons is it reduces the desire to involve oneself in region chat and making friends if you randomly hit the minefield because you said something [not politically correct] even if it is scientifically and factually correct. The WORSE aspect of this is not knowing what IS and isn't crossing the line. An it makes it even less likely I want talk in region chat or to support the game with buying Prime Access Packs.
I understand that having a system to deal with bad actors while being fair to normal players is a difficult technological challenge. Including the concept of it's a "privilege" not "rights" to chat.