HWID ban
Also called: Hardware ban
A ban on your PC rather than your account, so every new account on it gets banned too.
An HWID ban bans your hardware. The tell-tale sign is new accounts getting banned within minutes, often before you do anything. Reinstalling Windows or using a VPN doesn't help, because your hardware IDs stay the same.
The fix is a spoofer and cleaner. Game guides: Fortnite, Rainbow Six Siege, Apex Legends.