I think the bot percentage is proportional to how big a subreddit is and how profitable influencing people browsing it is.

Niche community about how to proplift (stealing small cuttings to grow your own plants)? Zero or close to zero bots.

Crypto community with thousands of comments a day, where it’s all speculation that can’t be objectively disproven* so bots stick out like a sore thumb and tons of money flying around? You better believe the bots are all over that.