> everyone on HN who signals interest for a social network they pay for will get to see how viable such a business model truly is.

Let me get ahead of you there. They would only pay for a quality product which Twitter is definitely not, as a ruiner of modern discourse. Of course there's also the catch that there are no quality products anymore. The whole world of products is devolving at almost the speed of Google Search. But definitely paying is the superior business model