https://www.dw.com/en/disinformation-sites-generate-over-200...
And even if they do expect to turn a profit off these sites, the clear patterns in their non-bot content need to be explained. Why do all of these sites seem to be focused on mingling Republican propaganda with their filler content? Why not have some sites featuring clickbait for a different audience?
I.e., presume their real aim is some kind of initial email contact, possibly soliciting donations/support for some 'cause'. If that contact email can reference ten of these fake websites, all of which support the point made in the initial email, does it increase the rate of donation/support return from that initial contact email?
And I highly doubt that they're focusing on email as the means of reaching new users. This clickbait is meant to spread via Facebook posts.
This suggests another possible reason. Those behind them have found that if the 'fake' site appears to be 'local' enough, it will be seen as more reliable and/or it is more likely to get "liked" (given your "spread via Facebook posts"). Possibly their A/B testing has shown that fake 'local' stuff gets more spreading on FB?
All you're missing out on at this point is the obvious partisan motivation.
One reason I can think of for increased Republican content is because of outrage economics. They tend to generate more clicks. It's also something that isn't catered to by the big news networks. Smaller sites I'm regularly visiting for over ten years have also shifted in this direction and those type of articles always generate more comments than other ones, so the tactic seemingly works.
That's just filler: low-quality automated content so that the site appears genuine at first glance. These sites are not intended to attract regular readership. They're a context into which propaganda pieces can be inserted and be linked to on social media. Readers are expected to hit the site only for specific articles, and to not be motivated to explore much further. If these sites were a genuine attempt to make money by peddling local news, they would have more ads and at least some mention of weather or traffic.