Unless it was just urban legend, VHS supposedly won out over Betamax because there was more porn available. It was the first “killer app” and helped make early rental stores profitable.
And similar things happened with all forms of the internet: Gopher, BBS (though maybe less so, it was before my time and so bandwidth limited), Hotline, the original cam girls and blogs.
It’s just porn, all the way down. That’s why it’s called the oldest profession.