It's entirely possible for decentralized instances to provide safety, but most don't/won't. I'm super happy with hachyderm.io for example. ♥️??
But a larger company is going to integrate with the fediverse, and fulfill the most basic user feature request: "As a user of your product, I would like to know that signing up will not expose me to death threats from nazis" ??♂️
Then more new users are going to flow there.