Hello!
This is a great question and please understand that our service is only 1 year old and we are working out a process to work with all of our users (free and paid).
The idea is to perhaps keep an eye on your bandwidth and determine if it makes sense to upgrade. Right now an automated function to auto-disable sites that exceed bandwidth is not in place. We see no abuse of our services currently so there is no urgency to change this policy.
The motivation, for us, is to get a notification if someone generates 50TB of traffic on a 1TB free plan. Obviously that level of bandwidth usage is unacceptable for us , providing a free service especially.
In the future we may provide an option to not necessarily upgrade to a $5/month plan but purchase a bandwidth limit increase only for a much lower cost. Also we’re open to suggestions, if you have any ideas!
Thanks