I cannot fathom in this day and age of litigation why anyone would want to start their career as a flying instructor with the risk involved. Just signing an aircraft out on a private hire could end up being a massive court mess and career ending.
"he/she/they didn't do the brief with the correct coloured pens on the whiteboard when I did my PFL lesson. I ran it out of fuel and pranged post PPL and its the instructors fault from 5 years ago"