I suspect decreasing tips also has a lot to do with tip exhaustion, I think it's becoming increasingly acceptable (at least in my circles) to hit the "custom" option and put in a smaller-that-suggested tip (or even nothing at all).
I've stopped tipping through the POS devices entirely. Now when I tip, it's in cash and an amount I've decided on, not an amount the business is trying to talk me into. I also have reverted to only tipping for traditionally tipped stuff, not the everyone and their dog who asks.
Ironically, those stupid tip kiosks have cost severs tip amountage with me
I used to drink a fair bit, so at the end of a tab, I did not want to do arithmetic and would just put an “easy” number that looked good. This could often be upwards of 35%
But if you stick a touch screen in my face with even easier, one-two taps on a preselected amount, I’ll go with that.
Also I’ve accidentally no tipped a few times with them because I get frustrated with the incessant screens asking about receipts, emails, etc. that I just click past the tip screen.
