Great question.
1) Zecharia 8:23 is about a personal relationship between a Jew and 2800 Gentiles, non-Jews. It is not about organizations. Every Jew must participate. Therefore, there should be hundreds of thousands and millions of sites like this where every Gentile/non-Jew can find the Jew right for them.
If we would create the Zecharia Project, then many Jews might say "isn't that nice that so and so is taking care of this" and then exempt themselves from taking action. By calling it Rabbi_______.org, we want to make it clear that this site is for Rabbi Smith and those who choose to connect with him and every other Rabbi should be doing the same.