I doubt if Buffet misses the opportunity to make more money from crypto because, as an entrepreneur and one of the richest people, he will get advice from people around him about crypto and invest in crypto secretly. Maybe Elon can be one richest people in crypto but who knows, the title will change in the next year as with growing of the crypto, that will attract more richest people to invest in crypto. They do not want to be late to decide to invest in crypto, especially they already saw what happened to many people who already invest in crypto.
I don't know if Buffet takes advice from anyone. He is someone who gives the advice. And as far as I know, he still refuses to endorse cryptocurrency. He is in his 90s and is unable to understand the technology related to cryptocurrency. Anyway, at this age, he will be more concerned about the preservation of his wealth rather than increasing it. And for doing that, he needs a stable fiat economy. Alternatives such as cryptocurrency pose a danger for that status quo. Anyway, his time is over. He made his profits during the last century and he should be proud of that. If he was making the investments now, then I am sure that he won't be as successful as he was earlier.
We do not know his mind, but if someone has more wealth than the other, he will want to get more because that is human nature. We do not want others can have wealth like us, even closer to us so we will try to increase the wealth in many ways. Yes, he is in the 90s, but that does not stop him from having a passion for getting more money. Maybe he does not understand but he has an advisor's finance who will advise the opportunity in crypto and he did that without us knowing. We admit that he made his profits during the last century but that does not mean he will not explore a new thing that he can give to his descendants.