What is the point of limiting new users to three replies per topic?

If you don’t read the yellow box – which shows up even before you begin typing in the screenshot shown above – then we don’t want you as a user. What do you want the software to do, drive to the person’s house and have a face to face intervention with them?

The “sorry you can’t reply any more times” I think is a shared post rejection message – it applies to a number of rate limits on posting in the topic. @eviltrout would have to clarify.

And all this discussion is still totally off-topic. If you own (created) the topic, I don’t think there’s any reason to limit your replies, even as a new user.