This seems like a dark pattern to me. Has the tip economy gone digital? Are those drivers in similar position as some service workers where they can't make their ends meet without those tips? Or maybe I am overthinking and this is a solution that does work.
But in larger orders the suggested tip sizes suddenly are percentages, as opposed to large flat values and are usually closer to customary sizes. To me it sounds like they know tips are important for the drivers, and without tips there's barely going to be any takehome as those companies will take most of it themselves (and still be unprofitable), but as a solution the try to get users to enter large tip amounts.
The 15-minute delivery services like Flink [6], however, do offer at least the option to give a tip.
[2] https://www.ah.nl/over-ah/gemak/online-groceries
[3] https://www.ah.nl/over-ah/gemak/ahcompact
[4] https://www.jumbo.com/boodschappen-bestellen/thuisbezorgen