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The bots are here!
(sh.itjust.works)
This is the first private message I get on Lemmy, it immediately seemed suspicious to me so I tried the famous thing.... and it worked!
All that does is compel the recipient to stop what they're doing and wait until you send the message, which, if you're typing up a wall of text, could be minutes. This is like calling someone on the phone and, when they answer, saying "hello please hold". Don't do it; it's super rude.