Do ISA agreements only apply to a job in tech?

I co-founded a technology company called Formation.dev but we are building a technology platform to train engineers that's nothing at all like a school. We offer ISAs as a choice to engineers who train on our platform to pay for that training, yes, but it's fairly irrelevant, it's a choice people wanted and we are indifferent. As long as you put in the work, we work with you for as long as it takes to get a new job you love, so people like the ISA model to wait until that transition to pay.