> By introducing so many versions of design, it forbids a pattern to be established and recognized by the users. Essentially, the users look at the design, get confused about if there is going to be a “Skip Ad” button or not, get tired of trying to figure it out, and finally pay less attention to it which increases the chance of them ending up watching ads that could have been skipped.
Honestly, this does not match (at least) my usage pattern: I am so annoyed by the ads that I always look for the skip button - sometimes successfully, sometimes in vain.
(by the way: I see strong evidence that Google's (and thus YouTube's) ad network has a lot of difficulties finding ads that are of interest for me - likely because I have quite different interests from the typical citizen; perhaps this is the reasons why YouTube's ads are so annoying for me that I always look for the skip button on YouTube).