The way I see it there is no “real” crypto currencies in revolut, since you are not able to:
transfer crypto-currencies from elsewhere to revolut
transfer crypto-currencies from revolut to somewhere else
pay with crypto-currencies for services/goods
Basically you can change “bitcoin” to “horse” in revolut and it would work the same, just convert your EUR to “horses”, and when you want to do any operation with your “horses” convert them back to EUR.
I have not used this feature myself, since I’ve only heard negative feedback, so please correct me if I’m wrong here.
p.s. I feel a bit insulted by the requirement to recruit 3 friends to revolut to get access to crypto features, since I was and still am advocating revolut on various community forums and basically everyone I know.