This is a meme I see online often (and in the show Silicon Valley), but I don't think it holds up in practice.
Re: payment systems, Visa and MC are notoriously unfriendly to porn vendors, sending them into the arms of crooked payment processors like Wirecard. Paypal grew to prominence because it was once the only way to buy and sell on Ebay. Crypto went from nerd hobby to speculative asset, shipping the "medium of exchange for porn purchases" entirely.
As for broadband adoption, it's as likely to have occurred for MP3 piracy and being 200X faster than dialup, as it was for porn.
Re: payment systems, Visa and MC are notoriously unfriendly to porn vendors, sending them into the arms of crooked payment processors like Wirecard. Paypal grew to prominence because it was once the only way to buy and sell on Ebay. Crypto went from nerd hobby to speculative asset, shipping the "medium of exchange for porn purchases" entirely.
As for broadband adoption, it's as likely to have occurred for MP3 piracy and being 200X faster than dialup, as it was for porn.