So my sister owns a restaurant

Genuine critics know when and how constructively and fairly, to both praise as due and to point out deficiencies.

A lawyer's task in a court hearing is to find weaknesses in the opposition case.

A politician's task is to praise own Party and demolish all the the others..

So lawyers and politicians are not usually good critics.

Oh - and bribery is a serious crime.

every time i want to do something not nice, i consider the karma that my actions might yield (that's just me, though)

maybe leave good google maps reviews with nice pictures instead

No that's slander and sabotage 😏 crooked