>Creators can just omit that some product is sponsored.

Not true in the US, where the FTC requires (and has required for decades) disclosure by the creator to the viewer whenever a payment has been made to the creator to promote anything. On Youtube, this is typically done by the creator's saying (in the video) "this video is sponsored by Foo Corporation", or, "I wish to thank the sponsor of this video, Foo Corporation".

Personally, I'm unhappy with Premium's built-in sponsor skip. For one thing it becomes available to me only after enough previous viewers have manually skipped over the sponsored segment. For another, it sometime skips ahead too far (probably because the viewers who manually skipped weren't precise in skipping exactly to the end of the sponsored segment). I'd much rather Youtube allowed the uploader to declare (to Youtube) that the upload is free of sponsors (e.g., by checking a box) and then punishing the uploader somehow if he routinely declares falsely. With that information, Youtube could and IMHO should give me the option of telling Youtube somehow (e.g., by checking a box) that I prefer for sponsored videos to be omitted from my recommendations.