It seems to me that witnesses (TOP20) can do something like that because they set the rules. For example, during the war with Justin Sun, all @gtg posts were deleted: https://steemit.com/@gtg
It's just a ban on their frontend / APIs, my content is still out there. It wasn't deleted. You can remove your own comment and that's the only way (but it has to meet a set of rules like no replies, no pending payout, etc.) but that's just another operation. What's done is done. If a comment got into a block it will be there forever.
It seems to me that witnesses (TOP20) can do something like that because they set the rules. For example, during the war with Justin Sun, all @gtg posts were deleted: https://steemit.com/@gtg
It's just a ban on their frontend / APIs, my content is still out there. It wasn't deleted. You can remove your own comment and that's the only way (but it has to meet a set of rules like no replies, no pending payout, etc.) but that's just another operation. What's done is done. If a comment got into a block it will be there forever.
Thanks for the clarification.