Crypto instead of a prenump?!?

We all know that in a relationship, marital or not, there is the evental talk about finances. A friend of mine stated that his spouse was trying to taking too much control of the direction of their finances. He believes in diversified investing but isn't allowed to even though he contributes equally to their finances. Now, instead of bringing up the issue he's taking a more passive-agressive route by investing his profits into crypto. What do you all think he should do? What would you do?