Yep, this has become reeeaaally visible since a week or two.
I used to regularly browse reddit without being logged in, it was a way to experience the default reddit experience for my region, see what people from my country would discuss as many French speaking subs were included.
I could scroll a couple of pages worth of moderately interesting and quite diverse content.
Now it’s mostly garbage, I barely reach the end of the first page. The diversity and the quality has gone way done, it’s like a distilled facebookesq version of summer reddit.
You have to remember that APIs were used massively by third party apps users.
I don’t see a reason to attribute the API related drop more to automation than users stopping browsing reddit because third party app ban.