As soon as you use a significant portion of it all the time, you don‘t have „1Gig internet“ to advertise anymore.
Be happy to be able to provide actual 1Gbps as a best-effort to your coworking space! If I were a customer, I‘d be glad that I can download my 50GB of whatever I need asap and use the full connection I paid for, and not have 50% of it clogged by some TOR relay or stuff like that.
I mean, the customers are paying for it, right? So they should be able to use it for whatever they need, as much or as little as they need.