What happens if my license expires?

I have paid for a one year license. I use wpmudev for a few of my sites and a few client sites. I’ve delayed implementing a few tools because my renewal will be $420 and I’m not sure if I’ll be ready to spend that much. I don’t charge my clients for this (not sure if I can), so I’d be footing the bill myself.

If I let my license expire, does everything break that’s been installed?

Thank you