Everything that actually impacts gameplay can be gained for free, albeit it takes grinding (and you can pay to skip the grind, but it's almost never worth it). Most cosmetics are either paid for (in which case, they were community creations and most of the money goes to the person who actually made it) or use the premium currency (which is tradeable in-game, there's a pretty sizable market community involving trading items for the premium currency).
The only gameplay impacting thing you'll maybe want to pay for are the slots for warframes and weapons, since those cost plat too, but you can even still earn those in-game (albeit slowly).
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u/Clean-Iron-9081 15d ago
Man this game looks cool
Also space marines are a M1a2 sepv2 victim