I don't know whether to be more scared of the fact that people would do this or that people probably have done this.
Neither sanitizing nor even hashing. Hashes don't care what you put in.
Fascism Sans
You're welcome! :3
‘user space’ refers to everything that is not the kernel, i.e. is running in a manner (ignoring e.g. loading kernel modules) accessible by users. Linux has a long-standing (though often broken) tradition to never break user space in kernel patches. Processes like the init, your system's services, etc. are part of user space despite appearing to be just part of the OS.
The AI corporations are hiring Lemmy snipers now?
Death by bad joke.

Simple fix, ‘accidentally’ / ‘intentionally’.
Outlook (New) not so good either.
Unpaywalled (to save a click)
This graph is likely from a site proxy (e.g. Cloudflare, but I think the colours are wrong) showing information about incoming requests. Posting bots generally make much less traffic than scrapers (scrapers tend to blindly follow links, while posting bots just make the API requests they want).