Read google Adsense policy to know If crypto websites are accepted or not.

Regardless of the answer though, I wouldn't suggest using them. If you are interested in crypto, you probably want to be paid using bitcoin and also, you don't want your users to see irrelevant ads. Check this thread: https://bitcointalk.org/index.php?topic=1108616.0 (It's far from being updated though but gives you an idea of what you should look for).