Hi guys in last month I have been always asking my self one question, one scenario about ETF and I dont see such thing mentioned on news, so if someone can please explains me what i am thinking wrong, because i bet there is some protection again such scenario or I am thinking something on wrong way.

So like i understand largest bitcoin holders (if we count out Satoshi Nakamoto who could benefit even more) have around 100k bitcoins right ? and if someone out of them would put all on them at once on sell he would drag price down a lot right ? I assume we would go down to 30k, 20k ?

So why he cant do this if he have money to also enter into ETF big scale. Or perhaps thats plan of people at Blackrock, Grayscale?

I am thinking on next scenario.
One of top bitcoin holders enter ETF, put shorts on ETF, dump all their bitcoin, wait for dust to settle, close shorts on ETF, he go LONG, he buys again bitcoin

What am i thinking wrong ? if Satoshi nakamoto was some big company who could quickly buy ETF on large scale he could get fast insanely right and get a hold of even larger sum of bitcoin ?
What am i thinking wrong? This probably cant happen because of?