So the author has admitted to unauthorized computer access in his blog post. I'm wondering whether or not he will be prosecuted. Would the target he hacked need to press charges?
An experiment by me, I went into incognito mode and none of the recommended was what I usually get. I then fully watched a video that was recommended to me on my main account, and even after that, youtube failed to recognize me, instead, it only proceeded to recommend videos specifically in the category of the one video I had watched.
On non-incognito I get a page full of 6 second twitch clips. On incognito I get a page full of 6 second soccer clips and Turkish music videos (I live in a partly Turkish-speaking country, in my whole life I have never clicked on a single Turkish video)
Fingerprinting is used almost exclusively for anti-spam/anti-fraud. If a company wanted to use it for anything else they'd have to deal with a whole bunch of legal and pr trouble for relatively little gain. While you will be able to see WebGL Fingerprinting in the javascript of most every large website, if you scan for it dynamically you will often find it's only ran on a failed login attempt, for example. (Granted, I haven't scanned youtube in a while)
Good job, functionality fits my needs and the UX is really good. One suggestion, seeing as though the whole thing is cloud-based and I can't really be sure dynablogger will be maintained forever, it'd be nice to have an option to export the blog content to your own machine. While I could just ctrl+c ctrl+v, I think it's more convenient to be able to export all at once.