You messed something up probably. As one who has more than 5K accounts there isn’t a banwave or whatever.
Reddit have been making ban haves on unmoderated subs by end oj January/start Feb, accounts we can only suppose.
It happened last year aswell, I saw more the 300 subs (on a specific niche) got banned on a 25 day period on this timeframe above "due to unmoderation".
I had one with 80k active subs and also got banned without further notice, I had automod setup plus some other stuff but it was (in part) my fault because I should had put verication to have posting enable (whitelist post).
Once I notice, is that all subs had in commun some "unmoderation" lets say and reddit must have ban them due to spam because they had been spammed to death to get all that free traffic.
By spam, I mean crossposts mostly and also posts w/ links.
Other singularity and as far as I know, this was most in adult (nsfw) niche regarding onlyfans promotions.
Personal note: I built my own tools and have them running without any issues, just had to adapt my strategy.
My 2 cents on this matter.