Crypto hasn't really passed. It's just not talked about on HN anymore. It is still a massive industry but they have dropped the rhetoric of democratising banking and instead let you use cryptocurrency to do things like betting on US invading Venezuela and so on.

By "passing" the GP presumably meant that the fad phase has passed. The hype cycle has reached the natural plateau of "I guess this has some use cases" (though in this case mostly less-than-scrupulous ones).