@Gargron maybe one of the open source video editors would kick in help in exchange for the video editor being listed as theirs. Or like a small clickaway to their site if you want to edit the video more fully. I think many would be fine with promo of open source as long as it isn't tracking or obnoxious. Maybe even have a config option to hide that message for people who already know about Video Software X and don't want the message in their ui.