Why Doesn't Moz Use Wistia Backlink Embed Feature

[khi5]

I am using Wistia videos for my website and they have an embed feature which gives option to include a backlink to one's site, which I thought was great. I took a random Moz whiteboard Friday video (http://moz.com/blog/what-should-i-put-on-the-homepage-whiteboard-friday) and I do not see the backlink feature if I click on "embed" button below the video.

Question: why would Moz not use such feature? Bad SEO or simply because Moz does not need it?