These rich bitcoin holders are probably just holding their coins hoping to be richer in the future when the price increases. To say the truth 1 million of dollars is nothing nowadays to have a real rich life.
To live well they need to continue holding until bitcoin increases more its price and making investments meanwhile.
Burn wealth is rather easy. Is realy hard to get and earn those money/BTC.
Currnet BTC skalling drama helped many people a lot to get cheap BTC if you holded sood alts.
I will wait with my BTC till time when I can fully retire with my 50% BTC holdings it can take years decaded bit I have time.
Probably even single bitcoin holder will be rich in LONG therem.