Comment by usef-

Youtube didn't either at the time. The front page was widely seen as garbage, and everyone I knew watched videos because they were embedded or linked from external sites. "If they introduced ads, people will just switch to other video hosts, wont they?". Many of the cooler creators used Vimeo. It was the good recommendation algorithm that came later, that I think allowed an actual network effect, and I don't remember people predicting that.

The field is too young to know what will keep users, but there are definitely things that plausibly could create a lock-in effect. I mentioned one ("ChatGPT knows me") which could grow over time as people have shared more of themselves with ChatGPT. There's also pilots of multi-person chats, and the social elements in Sora. Some people already feel compelled to stick to the "person" they're comfortable talking to. The chance of OpenAI finding something isn't zero.