Typically, PC bans are due to software being detected on your PC that is against Bungie's policies. The includes, trainers, mods, aimbots, and cheat engines, even if not specifically for D2, but also can include things like debuggers for programing and some virus' or software that may try to inject code into D2.
[b]Bungie does not discuss restrictions or bans.[/b]
Bans are lifetime
https://www.bungie.net/en/Help/Article/11929
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Well that is fun guess my $100 was for nothing