I'm usually not the type that likes the "if you don't like it, leave" dribble.
But with instructors this slogan sticks.
The only thing they would lose is a bit more money and some privileges. On the other hand, as it seems, they could gain on days off and time off.
The company can't bully them, as it is a strictly benevolent additional task.
The normal line swine can't just leave. We all know why, kids in school, mortgage, no time for interview with other companies and so on.
But instructors would only pay a minuscule price for leaving their ordeal.
So why aren't they leaving???
Expect very little sympathy for your plight from the normal guys ......