It is not the first time I have seen this error, they have made the same warning to the new accounts just because of the Red Flags by the system.
Usually, it is an alt account and bonus abuse case, it is hard to prove that you don't abuse any promotion.
They count affiliate earnings as profit so many high-rollers open new Bc.game accounts to farm affiliate rewards.
BC.Game team has made this decision to prevent bonus abuse but you can email them or pm the representative account to explain the situation.
That warning is not correct anyways, it appears when the system permanently closes your account which is hard to recover. If your rank was higher than level 38 it is worth spending time on the recovery process, IMO.