Warren Buffet recently made a strong declaration that he wouldn't buy all of the bitcoin in the world for $25, and it gave us a better glimpse of how he really views cryptocurrency.
You are obviously new to all this, because although WB uses terms that are a little different from those of 8+ years ago, basically he thinks about Bitcoin today just as he thought in the past. It is obviously important to him to invest in what he believes in, regardless of the fact that investing in BTC could bring him billions over the years. I can also say that I would never buy most of what he buys, because I have never been interested in stocks, but that does not mean that I have anything against people who invest that way.
Secondly, the number 25 may have some significance in my opinion. It could actually indicate that he has invested $25 million into bitcoin and is one of the biggest whales today since I believe he bought bitcoin years ago when it was a lot cheaper and he was calling it "rat poison".
We can't know for sure if Mr. Buffett doubles the game all the time, but I’m personally more inclined to think he wouldn’t have dealt with such things in the old days - because if something like that were revealed, he would be labeled a liar. The question is how much does a man hold on to his reputation, and it seems to me that he would not sell it for a few billion $.