I never knew that either, I try and tip above average but that's why I stopped using the app, my $12.00 meal ends up at $22.00 with fees and tips....I had a year of no service fees if you spent over $12 but that's expired, and I didn't realize how addicted to that app I was I feel kind of bad for the drivers and after learning more in this thread, its a real thing
It's strictly a side hustle. Feel bad for anyone doing it as a full time job and depending on that income.