"I'll add $10 to your tip..."
After 25,000+ deliveries on 3 different platforms, I can confidently tell you that if someone promises to add to your tip, THEY'RE LYING. Oh yes I've had someone actually do it before, but for whatever reason, it's almost always a lie. You have a better chance at winning on a scratcher lottery ticket than actually getting that extra $10, that they promised you 5 times. Don't do anything stupid or extra for someone promising a tip unless you can dangle it in their face and demand that extra money in cash. I cannot tell you exactly how many times I've been fleeced by this, but I only get that extra if it comes in cash or instant payment like Cashapp/Venmo. SO MANY LIARS -- Especially if they're new customers. Either they forget or they can't figure it out or they were just manipulating you the whole time -- which is incredibly depressing, especially if you went out of your way to just be nice to someone and didn't expect a bigger tip. If you don't mind doing extra this for a total jerk who is playing you like a puppet, then go ahead. But it's damn near 99% of the time that you'll get ripped off. I even purchased something out of pocket once, for someone who had reimbursed me in the past, and got jacked for the $15.
So please... if you hear the words "I'm going to add to your tip", do me a favor and call them out immediately.
Say to them: "I would appreciate that very much! Unfortunately, everybody who says they're going to do that forgets to do it!"
Since I can't tell who genuinely forgot from those who did it just to piss me off, and because it's so close to 100% of the time that they add absolutely nothing (or $1) after repeatedly telling me they're adding to my tip... now I want them all to know I'm not f*ing buying it anymore.