This actually really fucking sucks. The Terraria team has been putting out good content for years, for free even. I hope he didn't lose any really important shit from being locked out. I mean he most likely did if he had it for over 15 years, but still..
Man what a shit show, how do you arrange for the guy to port over his game to your system and then completely ghost him when he needs help?
that's why you don't put all your eggs in one basket and go with services that offer some accountability (or outright do your own like mail hosting). it won't be free, but shit like that won't happen either.

