This is somewhat true for higher level jobs, but once you hit retail, and blue collar jobs generally, it stops being true.
McDonalds doesn't care if I also work at Burger King. Target doesn't care if I also work at WalMart. A plumber is generally fine if their assistant also works for another one.
All of this is subject to still doing the first job satisfactorially, of course.
You aren’t “clocked in” in to Target, McDonald’s and Walmart at the same time though. I imagine many of these drivers are marked “available” on lyft, Uber and probably some delivery stuff all at once.
I’ve always wondered what would happen if legislation required them all to open Go their API’s so drivers could use some “app to rule them all” that talks to lyft, Uber and more and helps them choose the best assignments....
At the moment, rideshare drivers don't get paid for being available, so the analogy to being "clocked in" at a regular job falls down.
This is how the rideshare companies claim an absurdly high hourly rate for driving — you only get that rate while actually giving rides and it is generally infeasible to be giving rides all the time. The effective hourly rate is much lower.
McDonalds doesn't care if I also work at Burger King. Target doesn't care if I also work at WalMart. A plumber is generally fine if their assistant also works for another one.
All of this is subject to still doing the first job satisfactorially, of course.