More apps are not automatic profit
Running two or three gig apps gives you more offers. It also adds noise. Extra pings can help you pick a better trip, or they can push you into a bad one because it was the loudest.
Use one rule on every app
Judge every offer with the same bar: pay per mile, pay per hour, and whether the drop-off leaves you in a useful spot. If DoorDash gets a loose rule and Uber gets a strict one, your choices get sloppy.
Finish the trip you already took
Once you accept, do not chase every new ping. Stacking decisions can make you late, add unpaid miles, and add stress. That stress is the cost people forget.
If you use GigDecider's voice commands, they only tap Accept or Decline when you say so. You still choose.
Look at the shift after you park
The gain from multi-apping is not that the phone feels busy. It is that you can see which app, area, and time of day actually paid. If you never look, you are guessing.
A short note after the shift is enough: which offers you skipped, which ones paid, and where you got stuck.