Logon required...Earlier this year, I noticed a few sites have changed security that requires a Logon to view webpages. Twitter, Facebook, LinkedIn to name a few. Direct links from other pages works... sometimes, but attempts to access a main page requires the user to logon.
I'm predicting there will be more and more of this to where all media sources will require some kind of registration/membership to view their content.
Regular visits to Google asks me to logon... I ignore them, but the day may come where I'm unable to do any searches without being 'connected'
Unless a YouTube video is restricted to adult content, videos are open to view...
When I search on a song or artist, they and others like it keep popping up until I clear my cookies and cache files. With a logon, YouTube would have more control to select adds they think the user would view. That would require clearing the history in the membership file.