But it looks like Steemit Inc have just taken down @thedarkoverlord...

Steemit Inc has not really blocked their account or removed it. Only in steemit.com its not seen.

Yeah, imagine they blocked their account... that would be unprecedented.

GDPR blocking is existing for a very long time. So its not really "unprecedented"

One day I hope a Satoshi creates a UI that connects to the Steem blockchain, then disappears and the UI can exist without fear of attack from govs.

This is actually possible. All we need to do is remove a file from the "condenser" application that powers steemit.com

Also the alternate front ends thats not implementing GDPR / DMCA support is already showing these accounts.