Allowed Callback URLs field limitations?

So what happens when I exceed 100 domains? Is there an enterprise option? Still feel that wasn’t answered.
After reading that article it more talks about carving silos around groups of users, not about multiple external domains pointing to the single instance. Say I created an Auth0 app per domain, what’s the limit on the number of apps (providing I can create an app from the management API).

Additionally i’ve continued a related question here How come "Allowed Web Origins" does not allow wildcards? - #61 by steve1