Why would you build it? That isn't being snarky, it is the question you need to answer. Why would people join it? What problem are you solving for them? Why are celebrities and influencers on those platforms to begin with? When you can detail out those answers, those answers tell you what you need to do to launch. You have to match the table stakes of existing platforms, which means you need to know not only what tho…
The reality is- real users won't pay for these services and the only entities that will pay.
Well, they're paying for ads with the knockoffs because (ironically) instagram et. al. won't run their ads because they're "bad for users."