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@paul having an explicit action to do that is not the problem! https://github.com/Automattic/wordpress-activitypub/pull/552/files#diff-1916afa363050c8d1ac472b3d135f3076b5f4322874a4eeea8fb30da87ef7c3c

...but what about doing it on deactivating/deleting the plugin? do people expect that? what about people that simply deactivate the plugin to debug something?

THAT is tricky :)