Alongside this marketplace of ideas. Another option could be someone with serious money can create an idea or problem he/she is interested in.
After which, other people can request to take up the project/idea.
The originator of the fund can determine and select individuals to create a team, then create said product/idea.
In the old days of the Internet, investors weren’t even needed to launch an idea. Things were much simpler back then. You could come up with an idea, build a simple version of it and sit back and see what happens. Even sites like eBay were very basic. I’d love to see the Internet simplify a bit.
This can now be done on the Discussions page but I do recognize your proposal for a specific section to post problems before the idea.