Based on my understanding it is undoubtedly that gambling is haram on their beliefs and we should respect that belief. I am not a Muslim guy but I haven't heard here in our locality wherein they were involved in gambling activities or even online I didn't see one so far. With crypto gambling we really have no idea what religions are involved on there but it is their own decision and risk to do such activities.
Some are true to their faith while the others are not, and seriously in our locals there's a lot of Muslims that are into gambling and due to a not so strict policy or not a strict implementor, they are able to do such kind of activities even if its not allowed based on their faith. I guess they are all humans that can fall into a trap of gambling and there's no religion can be safe from this, because gambling can be done by anyone depends on their willingness to gamble.
I have personally known several Muslims who have violated haram. In my opinion it is not about cryptocurrencies that help them to circumvent gambling bans, but about their unwillingness to follow the rules that they agree with on the one hand, but when it comes to them they do not follow them. In my opinion, the strength of faith is different for everyone and religion is not able to completely limit a person in something. This applies not only to Muslims but also to other religious denominations.