The fact you stuck to calling them "influencers" is already telling.
To me, they're just a "youtuber," after all, they make videos for YT.
I take anything I see with a massive grain of salt and compare what I know (if it applies), no matter who it is.
My experience with PPF is minimal, despite my sister have a clear bra on her BMW (I don't pay enough attention to it).
But there is a simple fact that, putting even a super this plastic layer can lessen potential damage (light scratches) on paint. If you can tear through it, then you've got bigger issues.
And the arguments for paint so far have priced them even higher than PPF... so just these basic details is enough. Is it a "miracle product"? Of course not, how goofed up would you be to even entertain that thought? But does it do its job? Basic reasoning already says "well enough."
You don't like it? That's fine... it should be based on your experience, not your perception of these so-called influencers.