You were shown three amounts. You did not pick them. The middle one was
built to feel correct, the lowest to feel embarrassing. Naming your own
amount felt like freedom, but the screen still asked the question, and the
screen was watching, which you could feel, which was the point.
Tipping expanded from a gratuity for service into a default expectation at the
moment of payment, applied by screens to transactions where no service
occurred.
This site provides no service. There is nothing here to tip for. If you tipped
anyway, the conditioning is the finding.
Payments are real and go to a person. No tip was ever required. If you
tipped anyway, that is real money, really spent.