Who cares? The bitcoin belongs to this individual. They are free to hold it, move it, sell it, trade it, dump it, anything they want, without any input or interference from third parties. Such is the beauty of bitcoin.
Well, money gets confiscated from people all the time, fiat I mean. Go on a plane and don't declare your large sum of money and guess what? you don't own it anymore. You have to declare it. Let people know you have it. So how you are describing is like a perfect utopia that ignores how things work in the real world. Only in imaginary bitcoin land do they maybe work that way until you try stepping out into the fiat world. You can't do anything you want "without any input or interference from third parties" not in the real world, only in your imaginary bitcoin land maybe.
How do you know that? Perhaps this person has just bought a luxury mansion for $100 million.
do you have a link to a story about someone doing that recently? i didn't think so. and if they did then don't you think someone has some serious taxes to pay? and wouldn't the government want to know who they are? the seller and buyer.