I've been living abroad for over half my life in a country where tipping is not the norm. At most you would round up. 19€ bill? Here's a 20, keep this change.
Going to the US soon to visit family and the whole idea of tipping makes me nervous. It seems there's a lot of discussion about getting rid of tipping, but I don't know how much has changed in this regard.
The system seems ridiculously unfair, and that extra expense in a country where everything is already so expensive really makes a difference.
So will AITA if I don't tip? Is it really my personal responsibility to make sure my server is paid enough?
To sum up, if you work in a business that relies on tips, you will defend the crap out of tipping and will be biased towards tipping uncontrollably.
If you are a business that wants to squeeze every penny, you will encourage and propaganda tipping as much as you can.
If you are anyone else you will wish for something different.
I recommend that you tip when the app says to tip, just simplify your life and if a screen says add a tip choose the minimum for now and don't worry about it yet.