Ask HN: What should I do with my unused 1Gig internet?

I have a gigabit internet hooked up for our coworking space, but due to the nature of businesses here, most of it goes unused. "1Gig internet" is a very good marketing message, so I am not going to downgrade. However, what should do I with unused bandwidth, ideally something that makes money?

A friend suggested running a Bitcoin miner, but that has a very long bayback period, assuming the price doesn't sink. Not convinced this is a good idea. Is there anything else worth doing? Thanks!