Again Monero (and fractional reserve banking) gives us some rough estimates.

For every 100k real coins they control. They can move x10 to x20 coins under normal conditions. More will likely expose them x5 will guarantee them being operational even in the most demanding situations.

Coinbase +ETFs are now the number one place setting the price. That's the only thing they needed and it's also the reason why they tried yo kill or decimate the influence of Binance.

Binance themselves running fractional reserves  on Monero knows perfectly well how to play this game.

Market price of Bitcoin is decided by only a very small number of coins ready to be sold on markets. With their scheme they can now soften or exaggerate any demand they see.

They basically can now absorb most of the buy pressure that could otherwise lead to another x5 or x10 market rally if they wish to do do.

That's also why it was important after years of resistance to get ETFs ready (for manipulation) BEFORE reaching and breaking out of ATH.