I care about the privacy implications, but not the length. Out of curiosity, why do you care about the URL length at all? What is the cost to you?
Pleasant? I could not care less about the pleasantness of the video code, but a shortened URL in this case would not be more pleasant, and it would be functionally worse, and barely shorter; all you’d be able to trim is the “?si=“. I’m baffled by this thread.
Also, only the domain is shorter
To me, the fact that the tracking code is visible and separate from the video code is evidence of the complete opposite of your conclusion - it’s evidence the ad business does not get to override either engineering nor what’s left of privacy control. Ad execs would surely prefer that the tracking code is not visible nor manually removeable.