One that seems to be going in the opposite direction of the norm: Starbucks.
They incentivize you to use their app via free crap every so often, birthday drinks, etc. The app used to ask you, after every purchase, how much you would like to tip. They took that function away a year or so ago. So now, you pay with the app, but if you don't have cash(lol, what's that) their employees get no tip. Kinda wild.
I assume they found some legal reason to stop doing this and just took the option away before they got sued, but who knows. Given the tip environment everywhere else, this one is a head scratcher.