Seems like you asking if you just throw out an idea on a GitHub page and then someone will come along and hand you a finished product.

Yeah, no, that won’t happen and isn’t at all how open source works.

There are two types of open source projects, small ones, and large ones.

Small ones have one, or maybe a few core contributors. These people do the bulk of the work and open the code up for a variety of reasons but often these are passion projects. The contributors work in their spare time, and generally the project has no or very little funding.

Then there are large open source projects, these typically have a foundation behind them. The foundation usually has big corporate donors and will have full-time paid contributors.