Each payment to this wallet has its message, which is player's identification, by this id a payment forwards through gates to the appropriate address of each company.
We don't know who owns or operates these payment gates, but they could be used for ease and additional anonymity, which makes sense.

Still, most of other coins are processed with a different address for each user, so it might depend on the coin as well.

We are not allowed to build further assumptions, and there is no really a point in it.
There are feedback from other users on this forum who receives their withdrawals on time and don't have issues with 1xBit. If that's not enough for you - we are unlikely to convince you.

Teams behind these companies are different.

Sincerely,
1xBit team