A decentralized social media app has some very serious differences from a centralized one. There isn't really a "central point" that can block / unblock accounts, all accounts are freely created on blockchain. Their fraudulent behavior then must be enforced in a de-centralized way too, so building an authority that would have the power to suspend accounts doesn't seem the right path to me.

It takes a while to adjust to this new way of behaving and when you get the gist of it, you realize that protecting from the bad guys is a community effort. Some members of the community are more prominent and visible on this specific activity (like @arcange, or @cheetah or @steemcleaner) while others, like me, prefer to educate, educate, educate a lot. Because, no matter how many scams are running around, you can't be scammed if you're an informed, educated person.

Both approaches work, each in its own way.