Tipping in the US is complicated. It used to be easy - you tipped waiters and waitresses 15-20% and pizza delivery drivers $2-5 total. Today everyone wants a tip. There are tip jars everywhere and it’s built in to various point of sale devices. UPS doesn’t accept a tip, but Amazon’s food delivery does.
So, is tipping good? Sure, if you’re receiving the tip then tipping is great! For the rest of us, tipping is a mixed bag.