That's not true; 4chan's always had a pretty decent number of users for an internet forum. GAB's one of the largest Mastodon instances. The only sense in which "No one" wants to use an unmoderated forum is the sense where you don't consider people with different views from yourself to be people.
4chan has an extensive list of rules; only the /b/ (Random) board is exempt from most of them - with the caveat, they say, that the moderators of that board are also exempt from abiding by the rules of who to ban and for what reason.
Even on /b/, doxxing, calls to raid other boards, complaining about the moderators/admins, submitting false post reports, impersonating admins, etc. is banned. On all other boards, even seemingly innocuous things like anthropomorphic (furry) imagery or even posting images of characters from the show My Little Pony (other than in the /mlp/ and /b/ boards) is disallowed.
Porn is disallowed on the majority of boards, and even risque images are sometimes removed; the rules are enforced to the degree where a SFW board (e.g. /jp/) can have threads about Japanese porn actresses, but you're not even allowed to post a nude.
4chan is quite heavily moderated and there is a whole team of janitors and moderators for all boards that respond to reports behind the scenes; you only rarely see them chime in like dang does on HN. For a while, even "share a screenshot of your desktop" threads were routinely being removed from the /g/ (Technology) board by janitors.
As for Gab, I recall they even ban softcore/suggestive pornography or imagery. It's certainly not the wild west just because its users are more sympathetic to the first amendment.
The usual deflection is that because spam and child porn still get banned, 4chan actually is moderated. Which is like saying that the FCC censors radio because they don't allow radio jammers.
There's a lot more moderation on 4chan beyond that. Most boards trim excessively off-topic discussion, trolling, or flamebaiting. Half the boards also don't allow NSFW images. These rules are regularly, even if not strictly, enforced.
The low-rules boards are often seen as cesspools by other users.
Your larger point is that 4chan isn't de facto moderated, but it is. Just because you agree with the level of moderation doesn't mean it's not moderated.
The even broader point is that nobody wants to participate in a truly unmoderated discussion, which may not be technically true, but if you allow "nobody" to mean "nearly nobody" (the author's intent), it's accurate.
Besides, one of the key aspects of 4chan is anonymity which could itself be considered a level of moderation; the default and indeed strong preference of commenters is to not be identifiable, which is a form of (self) moderation.
You can try to weasel around with what "moderation" means here, but the effect is largely the same no matter how you slice it; some stuff on 4chan isn't posted by tradition, not by technical capability.
That's not true; 4chan's always had a pretty decent number of users for an internet forum. GAB's one of the largest Mastodon instances. The only sense in which "No one" wants to use an unmoderated forum is the sense where you don't consider people with different views from yourself to be people.