I watched the link in OP's post. This is the first time I am watching Warren speaking about crypto.

He clearly describes crypto as a "non-productive asset" which its price relies on somebody that would buy it from a higher price. He kinda sees it as a pyramid scheme and sees no value in it.

The way he described bitcoin like it was a bank check book... He said something like "You don't value a check just because it transmits money."

That comparison was pretty negative in my opinion. I think It is pretty much like a fuck you kinda comment.

Obviously being able to send money without needing banks has no value to Warren B.