User blog comment:Brandon Rhea/Wiki Video Types and How You Can Create Them/@comment-26063280-20170419153113/@comment-26923519-20170419165626

They intend to replace some ads with relevant videos. Also, as an anonymous user, you can see plenty of ads, here and there.

I agree, I don't want this project to be mandatory everywhere. Firstly, it'd may ruin all of the hard volunteer work the loyal fans have put in a wiki. Secondly, it should only be mandatory for the top 500 wikis, and probably only 50 pages or less (per wiki) should have this feature.