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
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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.