I still can remember experiencing similar problems in other casinos aside from the one you mentioned and still I didn't conclude or suspected any connection between the two casinos, but with what the online support said maybe you did not share the whole screenshot of the conversation to give us more chat history to work with.

But since you said you have another screenshot you may share it if your deposit is still delayed or your account is blocked, but as the ops stated here, their agreed they have some software connection with the developer of 1xbit but I don't think that is the reason for them to withhold the withdrawal.