Comrade Rain

Happening quite a bit lately, apparently they are trying to detect third-party clients and block suspicious IPs for up to several hours. This also goes for Invidious et al.

What you should do: a few days before you set the deleted flag to your account, clear all the data fields that can be empty, and change the ones that cannot be empty. Change them to contain only nonsense. Everything. Your name, your password etc.

I doubt this would make much sense since they probably store older revisions of (most) data. You yourself said hard disks are cheap.