Mobile clickers need to be able to handle fierce amounts of tapping especially if they enable multi-tapping. It's very easy for me to mash so much over 4 fingers that the "app" (which is playing it online on phone because the apps shown don't exist) can't keep up. Then once I stop long enough for it to catch up, I lose all the taps I gave in exchange for the offline bonus. It's really aggravating.
EDIT: That's about 20-25 taps a second, maybe 30 if I really try.