I've definitely noticed that my favorite takeout place's POS makes giving no tip as hard as possible (Other->No Tip->Yes). "Fortunately" that is also a place where the owner is a prick and doesn't share tips with the staff so they encourage you to leave no tip.
And the really funny thing? If it wasn't about the same number of presses to leave a custom tip, I would generally round up at most POSes. Which isn't a lot, but it does tend to cover credit card fees on the average and makes card statements easier to skim. Of course, I have also noticed a rise in "Regular" and "Cash" pricing where those fees are explicitly passed on to the customers to begin with so...
I'll tip quite generously for a sit down meal or something like a haircut. For calling me up to the counter when my takeout is ready? Fuck off.