Had the same thought. Since around 2022-2023, most subreddits insta-ban you or hide your posts unless you have x karma (you gain karma by posting and getting upvotes).

So unless you happen to have an old account with karma from pre-2022, the only new users whose posts are actually getting through are the ones that know the specific subreddits that let you "karma farm" - ie, mostly bots and bad actors.

Also tangentially related, much of the weirdness of Reddit ("Thanks for the gold, kind stranger", fedora-tipping, narwhals baconing at midnight, references to weird memes etc.) also happened to disappear after GPT-3 came out, and get replaced with really strong opinions about politics and investments.