Wish I had the guts to do this:
https://www.yahoo.com/news/working-three-full-time-jobs-103301341.html
2 replies (most recent on top)
An engineer also had a full time job at Chrysler, while at Ford Full time. This was in the 90s. He would come into Ford first. Leave his coat on the back of chair. Then drive a M-plate to Chrysler and work all day. He would return to Ford at the end of the day to work for an hour or so. He did this for a year or longer, until Chrysler security noticed the Ford M-plate in the Chrysler parking structure. Ford and Chrysler security and HR coordinated and he was fired from both jobs. He got a job another OEM. Only 1 job this time.
@OP. Besides de legality of this trend, this is rare outside the IT/Management fields, and the people "working" 3 full time jobs are not providing their best. This trend reminds me of some programmer "subcontracting" his job to India years ago, where a guy overseas was actually coding while the guy here was playing solitaire in his computer at work.
While amusing for some, and not so much for the companies, the reality is that not many people can pull this. Having 3 full time jobs is very stressing, and cannot be considered as a long term solution. Like OT, it is ok for boosting the income, but doesn't guarantee keeping a job (nothing will).