I rarely go out to eat now. It used to be 10% in the UK ages ago. I tend to tip delivery drivers a standard pound on food deliveries if I can do it through the App. Not physical money since covid though. Pretty stingy I know but comparatively- for the hours they work compared to me, I'd bet they are better paid! That's mostly my fault for being freelance and not being the fastest worker or having the best business head. However, it's kind of weird that some jobs demand tips while others don't. I don't tip other delivery drivers. It's weird really, when it's the same sort of job. On principle though- it's bad really. Employers should pay their staff properly. Not expect customers to make up the deficit- on top of a likely very overpriced meal.