They are not just resetting inactive tutors, but also illegal tutors.
Not all inactive tutors have been reset ether..such as one of my old farms who has been inactive over a year now but still hasn't been reset, I'd still farm it...but it's too small, doesn't pay very well, so even if your tutor is active the developers can still reset it if they find it to be illegal, got to be careful these days with tutors, they ether get reset or you get striped farmed always good to ask the pupil before hiring and showing some respect, some of us pupils like myself put time, effort and money into our tutors to help them grow