When you use #ATProto (that is, #Bluesky), anyone can observe who you block and therefore index it.
Yeah, I imagine a whole lot of trouble can occur because of that. 
Discussion
Inb4 SJWs: "If you don't block {insertOffendingPartyHere} I'm going to block you!!"
Block list and follow lists should be private.
Leaving aside the term SJW—which doesn’t mean anything anymore—the fact is that when people and entities perceive they are blocked, they seek revenge.
One reason I don’t publish my blocklist on the Fediverse (or elsewhere) is because people who don’t like being there decide to attack those who put them on there.
People have no qualms with setting up multiple accounts and servers just to evade blocks.
My point is that that's not the only issue. The trend of cancelling people because of whom they follow is on the rise, calls to mass-block ppl are on the rise. The next logical step is to cancel people who refuse to block whom they are ordered to block.
It’s human nature to form blocs to exercise power. That’s literally why politics exists.
The question is how that power can be abused.