An interesting data point in the HTTP/0.9 and HTTP/1.0 switch-off that is happening. (The #httpd in #djbwares version 10 defaults to not supporting 0.9 and 1.0 unless explicitly switched on. But I am not alone.)
http://url.town/ is a WWW site with a 1990s WWW directory style.
You won't be able to (directly, without a protocol-upgrading HTTP proxy) use an actual 1990s WWW browser with it, though.
It doesn't speak HTTP 0.9, and it redirects HTTP 1.0 and 1.1 to HTTPS with modern ciphers that 1990s systems will not have.
There were people mooting switching off 0.9 and 1.0 in their servers at least as long ago as 2015.
It's actually happening. But because 0.9 and 1.0 are nowadays nearly 0% of all traffic (according to measurements taken in 2021), few people have noticed.
Except the people who spin up actual pre-HTTP/1.1 WWW browsers and try to use them.
IBM WebExplorer for OS/2 was released in 1994, for example,.