Is that due to patent issues? A lot of people running open source H.264 codecs¹ on Linux just ignore the patents and assume they're under the radar, but I bet a high-profile commercial entity can't get away with that. Like as a point of comparison, I remember the Raspberry Pi selling add-on license keys for certain codecs at one point for a similar reason, but that probably doesn't look like such a good strategy for a video editor on a niche platform. Then there was the thing where Red Hat had some kind of licensing deal with Cisco…

¹ I don't remember which implementations are subject to this or what the actual terms are.