As the crypto industry discovered: the paradox of decentralization is that every downside it has can only be solved in a centralized way.

You can't have perfect privacy in a system that has the exact opposite goal: federation. It means your data spreads by design and enforcement of any privacy-preserving feature is optional per instance.

The very loud minority on Mastodon that obsesses over safety has picked the wrong software. They should have just created a Telegram group.