Tipping 'nudges' are now popping up on DoorDash. If you don't leave a gratuity, you'll hear about it.
(www.businessinsider.com)
It’s very easy to increase the tip.
Tip in cash. Never use the app to tip. When the item gets to you have a cash tip ready, if you want to tip. Nice thing about cash, if they don’t want to report the tip, there’s really no way to prove the tip was given.