Hello,
If you wish to disable withdrawals, you already have a number of ways available to do this. This would make sense in a site destined to be a multi-vendor e-shop.
Blocking payments is not something that this plugin should do. What does WCMp do in this situation with other payment gateways? The same should happen with this gateway.
This is not a problem specific to cryptocurrencies but should apply to all payment gateways. What do you think?
with regards