Those are problems, true, but literally every modern competitive ladder deals with the three problems you're describing: smurfs, boosting, and trolls. Overwatch dealt with all three even when the game cost $40!
In return for those problems, the game gets an instant, massive increase in players. Monetization usually increases, since modern mtx are usually much more effective than either subscription or one-time-purchase models.
I'm not saying there are zero problems with going F2P. Obviously there are. But just as obviously, since so many studios have chosen to go that route, the benefits are worth it for the company. If the revenue benefits are worth it, they keep developing the game, keep running the servers, keep fixing bugs, rather than just letting the game die. That seems pretty good.
