Or have something similar guaranteed by EU Worker Protection. I was made redundant a few years ago and was paid 4.5 month salary on my last day.

This is quite good even by European standards. If you were paid 4.5 months because the law said so then it isn't harmonized, because in my EU country it is only 3 months notice afaik.

Also not sure if the Meta severance applies to contractors as well, but many engineers work as contractors by which they of course opt out of worker protections.

It's not the same as workers protection law is an EU directive so each country implemented it on its own.

yes but having both the sky-high US salaries AND termination conditions similar to Europe is kind of a win-win

Only for sky-high earners. Are low paid keyworkers getting same benefits or becoming homeless?

What are you talking about and in what country?

4 months of severance + 2 extra weeks for every year of service i.e. 20 weeks (~5 months) if you've been there for the last 10 years. So ~9 months paid holiday in total. Not bad at all.

No RSUs though, which make up 30-50% of compensation depending on level.

With the stock being down 70% from its all time high, the ratio has changed drastically.