Make it a business decision.

Find out how much money we can get policing crypto. We can even charge a greater percentage of potential funds recovered to extract an amount that would make it worth our while. At any rate, with that data we could determine if the money is better spent policing tax cheats.

In short if we're going to get paid well, we should help. If not? Well, sorry crypto bros. Sucks to be you.

I mean, why not both? There's an entertaining subgenre of police blotter reports where people report their illegal drugs stolen. If people report crypto assets stolen (which they very rarely do), maybe have a look at how they acquired them and whether it was reported to the revenue first.

What's the incentive to spending tax money to help protect a system who's focus is to undermine the state's control over its currency?