It's become silly. I go to Starbucks and buy a pre-packaged item. I walk to the counter. I put the item in front of the scanner. The operator pushes a button and the total appears. I put my credit card atop the credit card reader. The credit card system asks for a 15% tip.
Where I live (NZ) nearly all cafes have a manual espresso machine and making a coffee is a bit of work. We don't have a tipping culture at all, but I'd gladly tip a dollar to a barista who makes a better than usual coffee.
When I visited the US recently I noticed that manual coffee machines aren't much of a thing anymore - or maybe it was an area thing because I don't recall this being the case when I lived in the US briefly 10 years ago.
The upshot of this is - it's not skilled work to produce a coffee, they're not as good (on average), and they're easily 2-3 times the price per coffee after tipping. I can only assume that cafes in the US are making an absolute killing.
This is too much.