The only people who care enough to give up all privacy on the internet in exchange are deeply misunderstanding what normal people care about. Uncle bob would much rather the meme he made about weed not trace back to him or get to his employer with his fingerprint.
whether some video was filmed in xy doesn't matter unless you're in some sort of political crisis. Bob isn't. You're using a fictional bob to represent your own desires and present them as 'everyman issues'.
Bob doesn't care, and if he did he'd already use authentication. This is your problem, not bob's, but you're using a fake bob as some kind of 'personal shield' for an opinion leaning towards sacrificing freedom and privacy for very little in return.
What real bob wants most is probably less of you interfering in what he can see and read. He's not your kid and your intrusion on his freedom to read and speak are aggression against him.
I have definitely fallen victim to that one myself, and have pushed that argument when considering Apple's walled garden in iOS, and how much that has assisted me personally in not having to provide tech support for members of my family.
Unfortunately, between these arguments, and the continued push of individual/consumer responsibility and "vote with your wallet", the vast majority of people do not focus their attention on how technology platforms work, instead focusing their interest and energy in other areas, and will "vote with their wallet" for whatever is the simplest solution at the time.
First order effects are generally not considered when it's not something you care that much about. Second and third order effects are definitely not in mind.