The potential value of a communications platform is always handwavy up to the point the revenue is realised. It is well-nigh impossible to forecast what the social media landscape will look like in the medium-long term; especially if someone cares about profit. Twitter has only been experimenting with making money since 2018.

Twitter had ample time before 2018 to experiment with making money, though. I'm not saying that Twitter should have known how to do that in 2006, but they probably should have by the time they IPO'ed 8 years later, in 2013.

And Glancing over their S-1, they're making money now with the same means that they were planning to in 2013.

So in other words, you don't know either. And that is fine.