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Stuff can absolutly be deleted. If you overwrite the stuff that was previously saved there it’s gone. The point is that cloud providers often just don’t delete your stuff. And whatever you do your network provider allways knows what you search for.
Do we know for sure that Reddit doesn’t keep an edit history for comments?
Oh most social media probably keeps a copy. But your search history is usually stored locally, so it’s possible to delete that. Your internet provider only has a history of all sites that where visited via your internet connection and is unable to backtrack something to a specific device.