He seems to have a real problem with cryptos that function as currencies, saying that governments don't want them because they destroy governments' ability to control their money supply. It may be that many governments will ban bitcoin, but it is legal in Japan and other countries. In Canada, it's taxed as a commodity, and in the U.S. it's currently taxed as property. It will be interesting to see if states like Arizona and Wyoming end up legalizing the use of bitcoin and other cryptocurrencies in their states. If more states follow, that would make it harder for the U.S. federal government to ban them. Marijuana is currently illegal in the U.S. under federal law, but increasing legalization in the states is putting pressure on the federal government to soften its laws against marijuana.

There are also plenty of cryptos that aren't currencies but perform some sort of function. Even if bitcoin and other currencies were banned, it's harder to see crypto assets that aren't currencies but have legitimate non-currency utility getting banned.