I created a plugin for a niche markup language recently. I asked them if I could use their logo for it on GH, they said yes, I did and added a note to the licence file explaining that their unregistered trademark was used with permission.
It's not hard to do the right thing, either upfront or once you realize you'd done the wrong thing.
It's not hard to do the right thing, either upfront or once you realize you'd done the wrong thing.