If you check the account that you think is suspicious you'll find that it's followed by the official Twitter account of bc.game. Also the suspicious account you mentioned is listed in the affiliated section on bc.game's official Twitter account. I think bc.game needs to make an announcement about this whether this account is a scam and not affiliated or legitimate account with them because not gonna lie it looks somehow legitimate and fake.
it's the one following BC game official Twitter account and not the other way round. That is what i see here:
https://twitter.com/bcgbonus/following. As for affiliates, it's hard to verify for now. if you look at the website the account is promoting, it looks a little different from the other official mirror sites. Why is it so?
Maybe let me try digging further.