That may be a big part of it, but also it takes a long time to get large files from Mars to Earth. It seems at least plausible that the videos are released now

That may be a big part of it, but also it takes a long time to get large files from Mars to Earth. It seems at least plausible that the videos are released now because it took that long to send, or was queued up at a lower priority than other lower-bandwidth data.