One thing that frustrates me is that as far as I'm aware none of the delivery apps provide an option for me to tip the restaurant. Especially in these times I want to give some extra support to the workers preparing my meal. The lack of that option is one of the main reasons I usually pick up myself; if any of the delivery apps added the feature I would immediately switch to it!
UberEats definitely had options to tip restaurants earlier this year during the early days of lockdown. Sadly the option seems to have been removed since.
A few restaurants on caviar offered a $10 or $20 item on their menu that goes directly to their workers, which I thought was nice. Would be cool to see that productized.