Thanks for your thoughtful comments.
Would I be OK if LinkedIn gave similar tools to recruiters? No, because an applicant has a lot less power than a company. But I can see that recruiters would want that. So why wouldn't we want that on our side?
The "hire for a day, then fire" issue is interesting. Companies would tread more carefully there, though. Once you've hired someone, then you have a legal relationship with them. In the US, employment is at-will, but protections for firing due to race, gender, etc. still apply. So there's a lawsuit threat that would make this a dangerous game for companies to play.
Other threads claim that Meta did not actually rescind - those were more visa issues. Why is this such a big outrage? Because it's a breach in the norms of how job markets work. Re your analogy - Coinbase would certainly prefer not to have all these people in a downturn. But it certainly has options that the person with a spouse with health problems doesn't have. For example, executives could reduce their compensation temporarily to deal with this. The entering cohort of employees would make Coinbase less profitable, but won't by itself cause it to fail.
Do I really think that the CEO of Coinbase would take a 10% pay cut rather than rescind several offers? No. But the point is that Coinbase has options that mean it can do the ethical thing.