A lot of Leafs go into teaching because the pay & benefits are decent with lots of time off.

It's also a quick path to employment with only another year or two of post-secondary if one finds themselves with a useless Bachelors degree.

It's also a very cyclical profession. Sometimes there's a glut of subs, causing many new grads to give up & leave the profession for lack of opportunity. Other times there's a shortage with schools sticking non-licensed subs in the classroom, so people start training again.