ISPs may have dropped Usenet because not enough people used it, expected it or knew what it was as the web developed. It was no longer a factor in choosing an ISP. Providers I've used carried no binary groups or only a very limited selection so storage and pirating wasn't a big issue. They also no longer provide personal webspace but cloud services instead. I'd rather have webspace but Joe Public doesn't want, or know how to build a site - they have blogs and social media which offer a better experience at the cost of lack of control and selling their soul to advertisers.
I'm still an avid user of Usenet. I use nntp.aioe.org which is a free service and run by an Italian chap as a hobby. There are traffic limits and it's text only but no registration is required.
By the way, Gopher servers still exist out there.