There's no Stallman-compatible internet for him to use it on[0]. He goes through great pains to avoid identifying himself by accessing the internet directly, and to avoid interacting in any way with non-free content.
"...I generally do not connect to web sites from my own machine,
aside from a few sites I have some special relationship with.
I usually fetch web pages from other sites by sending mail to a
program (see https://git.savannah.gnu.org/git/womb/hacks.git)
that fetches them, much like wget, and then mails them back to me.
Then I look at them using a web browser, unless it is easy to see
the text in the HTML page directly. I usually try lynx first,
then a graphical browser if the page needs it (using konqueror,
which won't fetch from other sites in such a situation)."
Fair enough, he "uses" a web browser, for very limited definitions of use.
His beliefs about the inherently non-free nature of the web and his fears about surveillance still make it infeasible for him to consume the web directly, unless it's with someone else's browser.
I'm pretty much boycotting Facebook/Twitter(/Discord), and seriously thinking about boycotting YouTube/Reddit - am I not using the Web (or the Internet - those are not the same...) ?