I'm sorry to burst your bubble but Warframe is Pay 2 Win. Speeding up dojo stuff with platinum (gives an advantage over people who can't do it), speeding up foundry with platinum (also gives an advantage), ability to buy railjack upgrades with platinum, better drones - for platinum, boosters - platinum, warframe/weapon slots - platinum. I could keep going on and on. Yes, Warframe IS Pay2Win. The more you pay, the faster you progress. The faster you progress the more advantage you have.
Although the Warframe's P2W is nothing to worry about, since it is a coop game, not a PvP game. So relax.