Can you explain this further? I struggle to see how you get from "a lot of competition" to "de-facto net neutrality", and how that would continue indefinitely.
It seems to me that we had de-facto net neutrality from the outset but that over time, as the industry matured, the large players started to talk about colluding. It has taken pro-neutrality lobbying and legislation to maintain neutrality in what was previously a free market.