>>513041From my perspective it looked like this:
/pol/
userbase replaced with redditors + paid trolls
/r9k/
After r/incel (or something like that) got shut down it got invaded by redditors. Also, some group of hardcore gay autist are trying to turn everyone on there gay.
/a/
I never really browsed /a/ much but I believe it was also invaded by redditors and spics. I guess the redditors came from Kaguya threads (sadly) and the spics for Dragon Ball Super. Spics just love attention-fagging for some reason.
I might have a wrong impression of the state of /a/, but I'm definately not far off for /pol/ and /r9k/. Also, it might just be summer and I'm imagining things.