clearly not true because I ran an ipfs daemon before and didn't get any nasty letters.
I got nasty letters during the letterbombing attack on Tor relays. They were nasty letters forwarded by Hetzner from the people who actually wrote them. Pointing Hetzner to the page about the attack made them go away.
I don’t think I’ve ever migrated anywhere and not kep the previous thing running for a month unless I wasn’t worried about exactly that thing happening (to be fair, not prod traffic blackhole, but similar effect)
They send nasty letters with pcap dumps of your "hacking" attempts and it doesn't matter how wrong you think they are.