In my experience, this is not true at all. But, as you say you don't have direct experience to come to this conclusion, may I ask what makes you think this?
My personal theory is that it's connected to job security and how big personal problem it is to lose your job in a layoff. If you get laid off in Europe, your health insurance is paid from public budget now and you get several months salary from your employer. If you worked for a big name, it may be six months or more. If it was a small startup, you get at least two months.
Our US colleagues always made more money but also were more afraid of losing their jobs. All of that said from the IT perspective. I'm sure being a coal miner and getting laid off is much worse.
No fan of Suella Braverman, but she got fired not because of what she said, but because she publicly went against hierarchy, which seems to be a terrible offense. Which in the UK it probably is.