There was also a thread on the topic of using Adsense to monetize a crypto-related website here (click for link), been a while since the last post there but from one of the last posts in the thread apparently Google is cracking down on crypto-related sites using Adsense.

The link to Google's Adsense policies is here (click for link). Did a quick CTRL+F for 'crypto' and didn't find anything though, even looked under the 'content policies' tab.