Buffets big problem is scale. There is almost no where that you can deploy $300B in capital without destroying the market you are trying to invest in.

One of the reasons he loves insurance so much is because its one of the few places that can (productively) absorb huge amounts of capital....

All this becomes worse if you also believe that share prices are too high....then you get stuck with just hoarding cash in T-bills.

Having said that, yes he is ideologically opposed to Bitcoin for the same reasons as he is opposed to Gold, he sees them as non-productive investments that don't generate cash-flow.

I think he's wrong to not invest, but I understand his rationale. Ultimately his shareholders will be the ones missing out on the upside.

Trump could probably convince Buffet to invest that money in some type of large scale infrastructure project....think something like 10 regional nuclear reactors or something....