To he honest I have no clue, why or how exactly this happened, either way I personally have not seen many discord hacks before beside my own so that's why I said maybe they targeted the name, there are some other more prominent personalities that share the name bitcoinman I know of at least one that paid me $500 for a Facebook page I made called bitcoinman back in the day. You should be alright just change your password add your phone and set up 2fa that's the practical things you can do, I will be writing more about this kind of thing