I cant speak for the crummy employers, but my employer was very sensitive to immigration status. They were willing to push H1B holders out to the very last wav

I cant speak for the crummy employers, but my employer was very sensitive to immigration status. They were willing to push H1B holders out to the very last wave of separations to buy them as much time as possible to find a new role. But yeah, crappy employers are out there, so any H1B holder should educate themselves on their rights and the employers obligations during layoffs.