Good discussion.
So Lowest Common Denominator, if I want Follows, I need to use EventSub (which can also be used for Subscriptions too).
If I now decide to use ngrok (I have to for SSL), then I actually don’t need an extension at all, since it doesn’t provide all the events I need. The only thing I need is an EBS, either using my existing running server (node.js) (for personal project), or create a new dedicated server for EventSub.