Seems like just saying you're also a U/L driver is sort of a promise to tip. It would seem better for you, if you're gonna cheap out and not tip like 90% of other pax, to just not mention it. Then you'd just rapidly fade away in the driver's memory along with the thousands of other paxholes.
Where did you get the idea in your head that a driver telling you that they also drive Uber and Lyft is a promise to tip, I'm a customer quite often, never occurred to me as a reason for me saying that, I tell them that to make the driver feel more comfortable driving me around, basically I'm saying hey you're a driver I'm a driver just drive normally you don't have to be overly cautious you don't have to drive 30 in a 40 mph zone, you don't have to slap on the brakes as soon as the light turns yellow, and a word about tipping, I tip when a tip is obviously due, like any other passenger I'm not going to tip with a tip is not due, for example there's major constructions at one of the intersections in my city I've had two drivers go through that section and I tell them not to, I tell them way ahead of time where to turn so we're not stuck in traffic two drivers have told me "sir I have to follow the navigation", guess what no tip,
I have one driver a few months ago I get this car I say good morning he says nothing, a few minutes later I commented on something that was happening on the intersection we were passing passing look like a fighter broke out among someone he said nothing, I asked him if he drives mornings or night he said nothing, we got to our destination he didn't say have a good day or evening or anything he said absolutely nothing so I gave him a one-star no tip, if anybody is going to say maybe he was deaf, he could clearly hear, he had a phone call come in on the trip, a quick hello and a couple words and he hung up so he can obviously hear and can obviously talk, I don't hand out tips and five stars like candy they are earned.