Pretty much all of the big telcos, all of the networking equipment makers etc - are made out of porn money at the end of it all.
> In 2010, out of the million most popular (most trafficked) websites in the world, 42,337 were sex-related sites. That's about 4% of sites.
> From July 2009 to July 2010, about 13% of Web searches were for erotic content.
Granted, that's number of sites and not content/traffic, but streaming has exploded in the past decade, so I doubt it's gone up.
They also specifically call out the "50%" claim, and say it's an outdated one from the early days of the web, from when it was more niche and had a more male-dominated culture.
Side note, the most interesting part of the article, and relevant here:
> So what’s the most popular porn site on the planet?
> The single most popular adult site in the world is LiveJasmin.com, a webcam site which gets around 32 million visitors a month, or almost 2.5% of all Internet users!
> You’re telling me a webcam site is more popular than PornHub?
But once again, ten-year-old data.
[1] https://www.forbes.com/sites/julieruvolo/2011/09/07/how-much...
For a small ISP that's purely buying transit, once they establish a presence at a major IX point and can peer with some huge content sources, it'll drop their transit bill in half almost immediately.
Then you do have porno content coming from huge hosting companies/entities such as Choopa.
https://www.peeringdb.com/net/813
It's actually pretty rare to peer directly with a porn host, if I had to guess at it, I'd say most of the traffic is coming in via transits such as hurricane, cogent, telia, ntt, etc.
one note, ISP traffic isn't measured in disk space measurements like terabytes or petabytes, it's measured in present tense Mbps or Gbps.
https://www.webroot.com/us/en/resources/tips-articles/intern...
>Web filtering companies used to always release competing figures on the number of porn sites they blocked, but these numbers were almost certainly boosted to get sensationalist headlines and to seem competitive with other filtering companies that filtered "less" adult sites. For example, N2H2 claimed there were 260 millionpornsites (ed. correction: pages) --haha, one for every American citizen! :) Conservative groups are always coming up with porn figures that are crazy high, too, especially with regard to children's exposure to porn.
Ask your 18 year old son and he'll tell you the truth.