@MeganTI'm not really the person that deals with the billing and knows the ins-and-outs of that, but from what I can tell, it's free but may count against some custom tables.

We've been using this for a few years and it is great! There are a few adjustments we have made here and there (I recently domain-separated the Depots in my environment) but I'm not sure that we have had any significant issues with anything.