They pay extremely competitive rates. They are the reason for and a source of complaints regarding gentrification in my area.
edit: as an example the starting rate for high school work-study and college interns is the hourly equivalent of $78k/yr plus the same benefits as full-time employees from the second they show up.
The work environment is spectacular. There is no work from home because that is a practical impossibility so the work-life balance is carefully considered and benefits are outstanding. There are no after-hours tasks (there can't be, really).
You show up, work 9-5 in a relaxed environment, go home, cash your fat check, and enjoy travel and hobbies.
From IPC soldering-certified technicians to senior RF scientists and everything in between we cannot find enough workers for the amount of work we have.
For sexy startups trying to use sexy AI to steal user data in order to serve them sexy ads yes, maybe the market is saturated.
For hard-STEM fields my experience has been that there are too few people who take their linear algebra classes seriously.