Yeah I do, and of course they claim everyone should give them more money. Since I frequently heard that the new standard is 20% I've reduced my tips to 10%, pretax. If a bill helpfully prints calculations and the lowest option is greater than 15% I will leave less than 10%.

Taxi drivers get $1 no matter the fare. The gall of that industry to even ask...

And even the slightest infraction of protocol and I leave 0.

I used to overtip all the time. I got absolutely nothing of value for doing it, so forget it.