Even the PS3 game can be played via an emulator. The tech is still evolving so you still need a fairly powerful computer but it is playable. For reference, I was able to test archiving various PS3 games on my now 11 year old gaming PC which was a medium-tier system at the time of the build.
While Warframe is a perfect example of a well done FTP model, you can buy a lot of stuff with real money in Warframe, it isn’t just cosmetics. But it has limited PVP and the community is fairly friendly, so it isn’t so much Pay-To-Win as it is Pay-To-Not-Work-Hard.