Typically, pc bans are due to software detected by Destiny 2 while running. These include but not limited to, trainers, aimbots, autofire, mods, graphics hacks, anything that injects code into games, debuggers for programing, even some viruses. any of these could cause a ban, [b]even if not destiny 2 specific[/b] or if the license key(s) were obtained from a less than reputable source. [b]Bungie does not discuss restrictions or bans.[/b] [b]Permanent account bans are only implemented with rigorous checking to ensure that the innocent are not punished alongside the guilty.[/b] [b]There are NO options to dispute or overturn account restrictions or bans.[/b] Bans are lifetime for that account https://www.bungie.net/en/Help/Article/11929
D2 has only been out for one year so not sure how you could have played it if the last time you played was two years ago.