Well, nowadays majority of the crypto gambling websites offer instant withdrawals,so I doubt this is priority for crypto gambling community. There were more anonymous casinos or bookies few years ago while it is hard to find reliable gambling platform nowadays. Promotions are important to bring more customers as first step btw.
Do you mean users prefer to prioritize mostly the way or method of withdrawals compared to deposits? Maybe that was true.
If I'm not mistaken and if my memory serves me right when the topic is about looking for factors in choosing casinos, it's always mentioned by most users that withdrawals should be fast and methods are those preferred by the majority. I didn't see yet much concern regarding deposit methods.
Either way, it's always a good consideration that gambling sites accept several deposit methods and are not just limited by a few options only.