Earlier quoted context omitted.
not sure where you get 'nearly every employment contract' from, but in the US, its pretty common for people in the retail sectors to have multiple jobs. My F500 employer actually actually acknowledges this is a possibility for techies, and gives us guidelines on how to avoid problems with NDAs, client poaching, etc. They don't seem to require any notifications unless it might compete with existing business.
Does this F500 employer have mind that you'd be working multiple FT jobs ? Or just the occasional (low-impact) consulting gig?
It was never mentioned in the training material - though starting your own business was, which I think is pretty "FT"