Edit: LikelySounds to me like an IP and/or MAC address ban (MAC address is tied to motherboards IIRC). I got banned once from one of my old favorite games (PSO2) for mistakenly swapping my vpn mid game. After a lot of troubleshooting and an apartment move in between, a MAC spoofing program is what did the trick.
Side note, does lemmy use markdown format? If not, does anyone know what it uses?