If you mean you can progress without paying... yes you. But it's a pain in the patootie to do so. You ain't winning games without either a carry lvl 255 or a paid weapone. Yes, you can win with Vanilla weapones, but you can't denie that a Dog ear is stronger than a Obeya of example. The game don't have a paywall or anything alike, but it's still damn frustrating to lose to the same people over and over again because you're just defenseless against them. I myself actually didn't realise that problem before I made a new account aswell.
tl;dr: You can play this game for free, but it sure as hell isn't fun playing against people with paid weapone advantage.
Merged.
I mean yeah, you can get a Ursus in the auction house... for like 1,5 Million whitch you earn by doing missions for hours... and play against people who... well... have an Ursus. And Medusas. And Dog Ears. You see the problem, right?
I mean you could alternativly just hijack stores for hours on end, but idk if you think thats fun. I certanly think it's not.