UPDATE (March 16, 2019): The ads discussed below as appearing on the Roku YouTube app (even when subscribed to YouTube Premium) have now vanished for me — at least for the moment. I have no word as to whether this is a temporary or more long-term change, whether this was a test that has now terminated, or any other additional information. But I’m definitely glad to see those annoying boxes gone, especially the one that was overlaid on the playing videos themselves.
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I pay for YouTube Premium because — among other things — I don’t want to see ads on videos.
But at least through the popular YouTube Roku app, YouTube is now continuously displaying BUY SEASON ads for some video program clips (complete with purchase price) in a blue box on the video control YouTube Roku app “watch pages” — and even worse, for a period of time (around 10 seconds) as a corner ad box overlay on the running videos themselves. The blue box ad is also present whenever you return to the watch page (e.g., by pausing the video), and the overlay ad appears for the same interval every time you begin running the video again. The overlay ad in particular is extremely annoying.
These ads are also present as a box on the regular web-based YouTube watch pages for these clips — where they are less obtrusive but still are ads on an ostensibly ad-free service.
YouTube Premium is promoted as a paid, ad-free service. The presence of these ads on Premium accounts (especially when overlaid on top of running videos — whether limited to Roku devices or ultimately deployed through other display devices as well) is not acceptable.
–Lauren–