As a fan in England we didn't get many fanzines (I guess they were pretty much before my time anyway).
Actually, the UK had a very active fanzine community in the 70s and 80s, mainly fiction, though, not articles like "Trek" and "Enterprise Incidents", but there were definitely UK "newszines" and "letterzines", too. Why many of them seem so rare now is because they were rare
even then. Even very notorious zines were often only of an initial circulation of 100 or so. Illegal photocopies often spread the controversial stuff beyond the editors' knowledge.
Since these things would never be allowed nowadays
Why not?
So long as amateur "Star Trek" fanzines don't attempt to make a profit - and don't attempt to resemble the rival licensed ST magazines, comics or novels - they are tolerated by Paramount/CBS, and always have been.
Internet versions of fanzines mean that fans no longer have to order by mail and pay postage, and fanzine publishers aren't up for any printing costs or storage problems. Hard to compete, so hardcopy zines have faded away.
I would love would be some website with scanned-in PDF's of as many old fanzines as possible for everyone (i.e. me) to enjoy today.
I'd happily scan my own published zines. But: the tricky bit is finding all the contributors. (I've tried.) They did not write and draw for zines in the knowledge that technology could allow their work to be shared in this way, and several of my contributors went on to become published pro authors and illustrators - and don't necessarily want their early work online and fully searchable. (I've asked.) Typically, copyright stayed with the contributors, not the editor.
("Trek" magazine was a bit different in that the contributors signed a contract, permitting copyright to transfer to Irwin & Love. Payment only happened if selected for a "Best of Trek" volume. My friend, Valerie Parv, now an extremely successful pro writer, contributed "Star Trek Jokes" to a "Best of Trek" as her first official writing sale, but elected to cross out the clause about
infinite reprint rights, thus she knew her article would never reappear in "The Best of the Best of Trek".)
I'm not talking about any dodgy file-sharing, just old fan mags from the 70's and early 80's that would never be allowed reprint.
But they would be allowed as hardcopy reprints. Unless they were full-on novels, comics or attempts to replicate Titan's official magazine. There's just no longer a viable market for hardcopy fan-created material. Hence the resurgence in fanfilms!
They kept talking about Trek as an ongoing magazine in the books for many years after the magazine stopped publishing, but then they seemed to have a ridiculously long lead time.
No doubt a pretense to continue the "Best of..." books, which did seem to have good print runs - and Signet did
all the distribution, of course. I'm betting Signet's lawyers had negotiated a contract that ensured Paramount would permit the books' existence, and that contracts specified it was reprint material of an ongoing fanzine.