Comment by dwaite

The open source definition does not mention community at all - it is a set of licensing requirements that certain rights to modify code must be maintained, not that upstream will accept your change or (for that matter) that you need to package it up and hand it to them.

And submitting a PR is almost wholly dissimilar from a conversation between friends over dinner or drinks. If you want to have a community around an open source project, it always has taken more than just accepting patches.