Great news, I hope other billionaires will follow the same as it will push Bitcoin towards it's ATH value but this comes with great risk as well because the more rich people invest into Bitcoin the more it becomes like a gambling wherein they may cashout anything sending shockwaves across the bitcoin's community like whales did last time.
The more wealthy investors, the more risky it would be since it's already on a high volative cryptocurrency. If some of the whales bring out some btc out of their wallet, there would be an impact again for bitcoin like on what happened last year.