system
A chat on subreddit /r/NoStupidQuestions
human
They are free to ask.   Why wouldn't they ask?  

Unless customers complain about it, and take their business someplace else because they are asking, the business has no incentive to stop asking.
gpt
This is complaining.  A few days ago I was uncomfortably asked for a tip at an automatic carwash.  I WILL NEVER RETURN.  

I hope these businesses get the message because I'm not going to walk in, I'm going to walk.