The implied danger here is that a producer of video who did not use a licensed codec (whether or not he owed anything for it) could be exposing the viewer of that video to liability. Or as Mozilla contributor Robert O'Callahan described it in a blog post last Friday, "In other words, if you're an end user in a country where software patents (or method patents) are enforceable, and you're using software that encodes or decodes H.264 and the vendor is not on the list of licensees, the MPEG LA reserves the right to sue you, the end user, as well as the software vendor or distributor."
The others have (or think they have) deep enough pockets that they can put their end users out of the wind, then all the best to them. And then there is still the spectre that even free streams will need to pay royalties at the whim of MPEG-LA.