What prevents miners from cooperating and causing intentional chain reorgs?
The top 5 ethereum mining pools currently have more than 60% of the network's hashrate. What prevents these pools from cooperating to cause planned reorgs? There could be many reasons to do it, like selling ethereum at 4300$.
I know that the consequences of something like this could be devastating (especially on weeks or months old reorgs) and potentially be disadvantageous for miners, but could they do it if they wanted to?
EDIT: As you may have already guessed this question is inspired by the recent MEV "chain reorgs as a service" fork (currently under development). I understand that this is manly going to cause 1 or 2 block reorgs, but assuming the code is going to allow "infinite length" reorgs (provided that the user pays enough) isn't this going to greatly reduce the security of the network?