All of those things are still in use, although perhaps not as much as before. I suggest to continue to use it.
(Do you know my first post on Usenet (using a NNTP client program I wrote myself, actually) was in 2019? I still use it, although there aren't a lot of messages on there, but there still are some.)
I suggest if you wanted to make up a web forum or mailing list, to set up a NNTP instead please. I also invented Unusenet which is a way to form newsgroup names which are not part of Usenet (you can have both on the same server; the names never interfere). You could also have multiple interfaces to the same messages if wanted, making more use better.
With other protocols too (such as IRC), a bridge can be done. For many kind of text-basedinteractive uses, telnet (or SSH) is much better than using a web page.