This is just the consequence of the API protests. Despite people claiming it had no lasting impact, admins coming in and making sweeping changes to mod teams replacing them with loyalists, alongside ramping up centralized feeds to serve more ads onto meant content quality took a nosedive. This is obvious in most subs if you actually look at who is submitting the threads (something the app and All/Popular pages hides in several views), most of these subs are dominated by a handful of accounts. It's a cycle too, because often they'll continue spamming subs in order to get on All/Popular, or make up weird stories to do so, effectively karma farming taken very seriously, with mods encouraging it because of the aforementioned loyalists.
It's all just driveby anger and reposts. Maybe some smaller subs with good communities here and there, but that often requires a mod team putting in substantial hours and remaining under the radar from All/Popular in any shape.
Forgot to mention, Reddit also started paying these accounts for posting. So a literal financial incentive to ragebait. It' called the "Contributor Program".