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You are asking for deleting petabytes of data. Some sides are interested in owning such data.

The real problem is going to be where history matters and you can't delete - for example archive.org and httparchive.org. There is no way to reproduce the content in the archive obviously, so no one will be deleting it. The only way is to start a massive (and I mean MASSIVE) sanitization project...

or clearing all the cache of Cloudflares website. I think that's do-able.

At this moment problem is not in Cloudflare's side, search engines crawled tons of data with leaked information, even though Cloudflare drops their caches, data is already in 3rd party servers (search engines, crawlers, agencies)

no I meant, get a list of all domains using Cloudflare, get that removed from the cache of Crawlers.

That's why he asked that the caches of all Cloudflare sites are dropped, not by Cloudflare but by these 3rd parties.

That might work. If said 3rd parties were interested in helping. Most of them might be but it just takes one party refusing to help and then you've still got the data out there.