Base on your point, it seems you are not into Investments or trading. What you have said didn't tackle why millionaires hate Bitcoin.
So I'm not that quite sure, why would they hate Bitcoin? To be honest, there are a lot of rich people who invest and have their own shares of Cryptos. They may not be publicly out for it, but surely they have one. Plus, given that they can afford to have one, and can somehow evade Taxes which is somehow an advantage to them also being anonymous with it.
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That is right. Most rich people may not show their ownership of some Bitcoin, or they probably sometimes do certain things to make FUD and spread it to the crypto world, Then, when the price has been down, they can buy more and pump the price again with good news.
This is actually commonly done by the whales to pump and dump the price.
A millionaire will not matter losing some small money and commonly they will prefer to hold for a long term, even they are doing daily trading, they will not do it by themselves. They can use advanced trading both with AI technology that costs very high. But, it can really work very well.
Additionally, some rich people may not like Bitcoin because they feel that this is about the economy and finance in worldwide, they cannot control the money again, they cannot think again they are the richest people in the world. or they cannot control the financial systems around the world.
Moreover, it is about the world bank system, it is contrary to crypto