Because several years ago, there was a fight over mandatory to implement video codecs in WebRTC. It was VP8 vs H.264. The biggest thing VP8 had going for it was no royalty payments. Cisco wanted H.264 because all of their devices supported H.264 and none supported VP8 and they already paid the royalties. So Jonathan Rosenberg, then CTO of the division of Cisco that managed this part of the business arranged to have Cisco cover the royalty payments for anyone implementing the WebRTC standards.
That wasn't enough, and WebRTC requires both VP8 and H.264 as MTI codecs.
That wasn't enough, and WebRTC requires both VP8 and H.264 as MTI codecs.