Go into any job or bond with open eyes!
I was bonded for two years by my current employer for an endorsement, no problem as I have been there 23 years! [and received another 4 jet ratings]
A previous employer had paid for an endorsement only 2 months before and I left with short notice so I paid him back some of that endorsement [maybe 50% of his cost] - I thought that was the honourable thing to do.