I have met several business jet pilots over the years who started as FIs and were in the right place at the right time - you never know who is going to walk through the door.
I was even offered a job myself because I refused to take an aircraft I didn't consider safe for a trial lesson - much to the annoyance of the flying school. I didn't know that the woman's husband (in the back seat) was a senior pilot for a certain company - that One small decision which I stuck by could have been significantly life changing.
As said above, life is full of surprises!