Janitors are often employees of a janitorial service company and the company is a contractor or the tech company. The janitor doesn't have flexibility, but the service company has some.

Personally, my spouse stopped working because their earning potential in the architecture field was so low compared to mine it didn't make sense, and also their benefits were poor compared to tech industry benefits, so it wouldn't make sense to not take tech industry benefits even if we both worked.

Corporate insurance is nicer than exchange insurance in ways you can't pay for, and likely wouldn't if you saw the cost, so it's nice to get the best of that.