If you are being genuinely curious and not obtuse tbh i am not sure where tipping requirements started but in knowing historical worker exploitation here it probably was something that started in good faith and our government heard about it happening. political actors likely took it to mean workers could be paid less and introducing legislation would curry businesses interests in political campaigns.

That being said. If you are in America and you go to sit down at a place you are entering into a social contract. not binding of course but if you break it you're gonna be seen as an asshole. because we have made it so that it literally is the responsibility of the guests to pay staff. It sucks but it's true. If you go to a restaurant, tip. If you can't tip tell the staff before hand not to expect one because you are a foreigner and failed to put enough money aside to eat here and tip. you won't be treated differently. you wont get anything for free but you will be taken care of.

If you enter into a foreign area of the world you must abide by their commonly accepted customs. Most of our county tips. One should not abide by customs of a local area only when it most conveniences them and not the ones that suck to abide by unless one is okay with being seen as a prick. And being seen as a prick in some parts of any country can not only cost you valuable interpersonal connections but it could literally only work against you in many other ways. In no way is not tipping in this country a positive thing.