Hostile to users as you're describing it is just "dealing with spam at scale." I find it hard to fault a service for doing sucky things that every other large service eventually succumbs to out of necessity. I can't be on some high horse and demand this company somehow magically solve problems no one else has.

Anyone who figures out how to have pseudoanonymous identities that can't be endlessly minted to evade bans that doesn't involve aggressive fingerprinting will be the internet's favorite child overnight.