France/UK/Ireland/New Zealand
With the exception of a few professional gliding clubs I can confirm that gliding instructors are unpaid as are many light aircraft instructors.
Moi being one in a previous life. Having been the victim of the UK system in the 1960s where instruction was a stepping stone from a 200 ppl to CPL regardless of ability I decided that having been gifted a flying career courtesy of the Corporations I would attempt to repay the gift to the aviation community at large. I did this on and off for forty years until I became old and got fed up with club and administrator politics.
Good luck