If you recall in the Jordan Peterson lecture embedded above, he mentions how porn makes up a much lower proportion of the Internet now than it did in the earlier days, and one of the main things that drove the development of the Internet and the technology was the male proclivity to search out sexual imagery. And with an industry revenue close to $100 billion annually, I have no doubt they have the power to influence where technology goes, and especially what technologies win in certain circumstances.
And it's not like they have to have any sort of meeting or issue demands or anything. It's really just as simple as choosing to use one technology over another, just as they described with VHS and BluRay. I wouldn't be surprised if it was the same story with the most popular codecs, and all kinds of other facets of the Internet, from HTML5 to even the layout of webpages.
However, you can see in the video that they used footage from that there were other reasons VHS won out. A lighter machine and higher capacity cassette was appealing...but also JVC had a better marketing strategy by creating relationships with the video rental industry.
So it very well could be that porn didn't necessarily drive the pick to VHS, but were actually following trend because that's what video rental stores carried, and they wanted to be on the shelf in that back room behind the curtain.
It may be impossible to know which drove which, but I wouldn't be surprised if it was basically just a feedback loop. As they said in the WatchMojo, VHS was more appealing to the filmmaker because they could fit more data onto a VHS cassette than the Betamax. So they might have favored it for that reason, and of course JVC wanted their tech to win, so they pushed video rental stores to use it, which caused movie producers to use it, which meant that would become the dominant/easiest medium available to video stores.