I spent two weeks delivering for Uber Eats and made $4.40 per hour

Sounds like a raw deal for a bicycle, but, how about on a scooter?

In cities that are not entirely built around cars (i.e. most European cities) you are much faster on a bicycle, esp. when you know the area.

Last but not least, esp in dense traffic: With a good bike you can accelerate much faster than you can economically on a scooter.

Electric bike might help you go faster, though. And charging those is cheap.

(But the extra speed might not matter in start-stop traffic of cities.)

In Sweden, as in most of the EU, electric bicycles are required by law to reduce the assistance as the speed increases and to cut out entirely above 25 km/h. So an electric bike wouldn't be much help to a courier, who would mostly be going faster than 25 km/h. (A faster vehicle would come under the moped regulations and the rider would need a license and insurance.)