It has gotten out of control, especially the Square machines with the absurdly high tip suggestions/choices. I have not seen it on self-checkout machines yet. If it gets bad enough I will shop elsewhere.
Same for any company that uses chatbots or otherwise prevents customer support.
But my guess is that people only care about price, and we'll just see an even faster race to the bottom as people get more conditioned to using disrespectful interfaces.
Back to tipping, it's ironically the impersonalness of shitty automated service that enables this. Few self respecting people would ask for 20% tips when they did literally nothing and you served yourself. But a computer interface can shamelessly nag you for whatever.
Don't tip anyone! Thats how it spreads
Today my latte cost $6+ and I tipped $2 for it. Walked away wondering how the hell it got so expensive :/ (normally I just make them at home, but was lazy this morning)