You might just round up the bill or leave 5% or so but in most places tipping isn't expected.

It's a byproduct of the Great Depression. Servers weren't employees and the only pay they got was the tip.

From all over the world. As was stated on the post above, most countries pay their service employees a living wage so they’re not accustomed to tipping. I was told that in Japan, a tip was an insult. Owners and managers of restaurants, may need to add to the menu some kind of explanation about our tipping customs or inform that the prices include a percentage for services.

The real shame is that US servers are not paid a living wage.

If anything needs to change, it's how you recompense your workers.