> so how exactly do you lay off people except remotely?

You have their managers do it. Privately. 500 people at once is just lazy and hateful.

How long does that take (900 people) - how does your entire 10k people company feel for hours and days knowing the layoffs are happening but not their fate? And how many of those said 10k mortgage originators and engineers do something stupid to customer financial data they have access to while under duress of this uncertainty?