I believe GitHub translates :+1: into a thumbs-up icon, so you'd probably want to limit your filter so it only applies to non-contributors. But still, yeah, it

I believe GitHub translates :+1: into a thumbs-up icon, so you'd probably want to limit your filter so it only applies to non-contributors. But still, yeah, it would be fairly trivial to require posts to be more than +1, or to display a warning when anyone starts a post with :+1: