Why is it big news that a man you didn't even know his name until today invested in cryptocurrencies, and Bitcoin is not mentioned anywhere? A man may have invested a few hundred or a thousand $ in some altcoin, and some call it great news, completely ridiculous from my perspective.
I get your line of thought, but then Mr Cook isn't an unknown entity as such. We can conveniently say though that he isn't a force to reckon with in the crypto space. Of course, he isn't. But who knows, people and interest do change. Maybe he's at this point realizing the need for the switch. Quite understandably, the paradigm shift is a gradual process for a lot of these old folks. And like you jocularly talked about him bringing Warren Buffet over, there's a possibility to that; I should think 🤔. After all, birds of a feather flock together. If they continue to stay out and away from Bitcoin, it's their loss. Just the same way it's for China.
I think people of his calibre are mostly thoughtful about what they convey to the public. Not everyone is like Elon Musk tweeting all day long what they think about Bitcoin. I can very well imagine that Tim Cook has been holding cryptocurrencies for quite a while, but would he necessarily decide very early on to make it public? I would rather not I guess, if I were him. Maybe he is trading cryptos like crazy, but would he make that information public? I really doubt it. By now he knows for certain that cryptos are here to stay and before politicians might decide for some moves against the digital revolution that he (now) has a stake in, he rather decides to raise his voice and let everyone know he has skin in the game.
Really difficult to tell whether he just recently bought cryptos or whether he is in it since 2012.