No one said you’re routinely doing it. It just happens for thing at orders of magnitude higher than what can be asked for software. One bad coffee, or meal or a %20 tip on a $40 order of pizza is far more than the 1.99 or 3.99 software can ask for, and it’s still too much.
Tipping $5 or a $10 is not a big deal, but a $1.99 app is like “ooof, is there like a free version?”
It’s not even a blanket statement on software. gamers have shown they are willing to pay, though their money comes with strings attached. Mac users are more willing to pay than Windows users who are more willing to pay than Linux users.