Is doing a particular thing which is banable/not allowed on a specific platform will it be considered haram while there is nothing haram in it

Assalam-o-alaikum, I am a gamer and we sometimes do account boosting for money it means u have to play from a new account and u have to make it reach a particular level or particular point and for it u get payed or u sell that account (considering that there is nothing haram in that game or may be some little bit harsh words only) but if doing that account boosting isn't allowed on that platform and u may get banned for it so selling those accounts will be halal or haram? While u are putting ur lot of time over it and again it(account boosting) has nothing to do with islam.