I don’t mind tipping 10-15% but complaints against the standard tipping options on payment machines are well deserved. Somewhere along the line business owners

I don’t mind tipping 10-15% but complaints against the standard tipping options on payment machines are well deserved. Somewhere along the line business owners figured out they can magically increase revenue by 10% just by upping the pre-selected tipping options. In DC I noticed a mandatory 20% service fee added to bills at restaurants—and they still ask you to tip on top of that! When does it end? 50% tips? 100% tips? Why not just let the restaurant keep your wallet?