I did it as a side hustle and the honest answer is: it can be worth it, but only if your area is busy and you treat it strategically. The people making decent money usually work peak hours (lunch, dinner, weekends), know the good zones, and often run multiple apps. People relying on one app in a slow town seem to struggle a lot more. 

If you’re on a bike and don’t have fuel/insurance costs, you’re already in a better position than drivers. A lot of UK drivers say car costs can wipe out profits, while bikes/e-bikes keep more of the earnings. 

Realistically, expect something like “some hours are great, some are dead.” Busy shifts might feel solid, quiet shifts can be you waiting around for scraps. I’d think of it as extra cash, not guaranteed income. Best move is sign up, test your local market for 2–3 weeks, and see your actual hourly average after all costs and time. If it works, keep it. If not, you’ve lost nothing but a few evenings.