In Japan for instance, you simply cannot fire someone without notice in these situations. You also have to prove that you've tried a whole lot of measures to avoid layoffs, such as reducing exec compensation, asking for voluntary resignations, etc. And I believe there needs to he some actual evidence layoffs are justified in the first place, same as in France I believe.
Strictly speaking, forcing a worker out in these recent tech layoff cases is going to be difficult. I'd expect both in Japan and other countries there will be much more generous severance package offers for "voluntary" quitting. The majority of workers will way that against the reality of staying in a company they know doesn't really want them anymore.
For NL: Those severance packages generally have to be applied broadly so everyone can make the choice. They usually result in the ones who know they can easily find a job moving on and the rest staying and thus don't happen that often. In general they let term-limited contract expire and offer people in early retirement. Doing layoff's when you are making a massive profit is not easy, it might be doable but it's not easy.
Fun part: Sometimes you cannot chose who you fire, the age distribution in the company may not change so firing everyone older than 45 is not an option in general.
The notice in the US is not a notice in the way you would apply it in Japan (or how common sense would dictate). It would be illegal to block someone from accessing company systems or premises just because you tell them "officially you are terminated in 60 days".
That "giving notice" is used in the message is because of some law (I forgot) that requires this time but also permits to actually block people from working as long as they are paid.
Strictly speaking, forcing a worker out in these recent tech layoff cases is going to be difficult. I'd expect both in Japan and other countries there will be much more generous severance package offers for "voluntary" quitting. The majority of workers will way that against the reality of staying in a company they know doesn't really want them anymore.