This actually looks like a good idea, but how the idea gets implemented, will likely define its true value.

It's already live! https://www.minohubs.com/

Apparently i am bad at reading, the blog post actually had a link to that aswell :)

Blog author here.

Would love to hear any feedback or any ideas from the community.

not sure I see the value for backers? most open source communities provide support and forums without paying.

We host discussion boards for free as well. Additionally, posts created by backers have their scores boosted and they visually stand out. Project owners and the community will recognise that a particular question is posted by a person who has a stake in the project, which might give the backer faster reply or assistance.