Sounds like Voice could be "all things to some people" and that's ok with me. Other social media apps can develop to fill other customer needs.
I hate saying any version of don't worry now about third world countries or anonymity needs. I intend to say meeting the latter critical needs has to begin somewhere. You develop a platform that provides a service. There will come the critiques. These will identify flaws that the next idea can improve (or exploit, but devoting energy to usage worries is another topic). As you have generically said in previous topics, new ideas lead to new ideas which creates new possibilities and suddenly there exists something that I don't wish to live without which I had previously not even considered a need.
So I vote for "Begin." But there is no hurry. I'm not talking about a capitalist version of a race to a product that yields more money. This can happen, but the ideas in the blockchain first exist, then yield to real things or services, and we judge them all as we go. I don't know what I don't know. I don't know what I want or need (other than peace and good for all). When new products or services give me a new freedom or joy in my life, I choose to pursue them. I don't need them, but might choose to need them.
Stopping now because I'm walking in a circle and abusing the little I learned long ago in some version of first year philosophy or ethics. Bottom line: Build stuff with a view toward making something good, constantly evaluate it, never fear to change it, keep your ethical magnifying glass close by and go try to make something.