Sounds like a camouflaged IQ test for the founders...
Or perhaps Y Combinator is great at funding startups, but incredibly bad with financial decision making.
In which case it is an IQ test for Y Combinator, which they have failed.
One of the biggest YC success story is Coinbase. It has literally got "coin" in its name.
It also trades under the ticker "COIN": https://finance.yahoo.com/quote/COIN/
And after a serious beating it's still value at $48 billion.
Put it another way: of all the companies YC funded, both those who succeeded and the countless who failed, only two companies, AirBnB and Doordash, are valued more than Coinbase.
I don't think YC hates cryptocurrencies as much as the typical commenter on HN.
As with all things cryptocurrency, the goal is to bypass financial regulations and external scrutiny.