A lot has to do with the blending of tourist-only places with more local places. In some countries, tourists typically tip, locals don't. But if you are a local

A lot has to do with the blending of tourist-only places with more local places. In some countries, tourists typically tip, locals don't. But if you are a local and visit a touristy place, you'll see the tip expectation, and then this starts to permeate the culture.