> Won't it result in 1000s of blogs mushrooming over night from purported bots-come-experts with some kind of engineered slant?
I don't say this to be rude, I really don't, but have you Googled something like "reverse a string python" at any point in the past 5 years?
> Whole "online communities" for the unsuspecting to join initially made up of nothing but bots "talking" to each other,
This has also existed for a long time, see SubredditSimulator etc. There are also sites that scrape forums and replace the usernames to do ad fraud.