I would like to know the point of this as well, I was ready to implement interactivity with my own private custom bot that is locally hosted, and that would push data towards a private extention for me (and perhaps a few other friends that use my bot). So locally hosted bot, which its IP can change any moment (dynamic) to a private extention.
We can have our own private extention be on Local Test or Hosted Test indefinitely for this purpose, give people the extention code that comes with your bot, let them host that themself as well, but the TAX requirements are in the way doing it like that for a non monetizing private extention…