Yup, they will shower you with 'promo' offers like '2 for 1' (where the price is typically just doubled for a single item anyway), then try to charge you like a 36% tip. They also straight up steal many of the tips from their delivery people as evidenced my many such threads/concerns online.

https://www.reddit.com/r/uberdrivers/comments/xyk7cx/uber_st...

In general, never tip on ubereats.