There is a individual/company that is creating lots of spam sites in my niche. It doesn't seem that they are trying to rank for any keywords, so I'm a little confused as to their purpose, but here's what they're doing. They scrape the top 10 Google results for each keyword and create a page - so if the niche is "widgets", they scrape the top 10 ranked sites for 'widgets', 'blue widgets', 'red widgets', and so on. A 'results' page is created for each keyword, which is linked from a home page. The results page always contains 10 websites - text is the site metadescription or similar. Each website gets a nofollow link back with the page title used as the anchor text. The host sites all have the keyword in the domain name - e.g www.widgetsxyz.com. The sites are thrown together but interestingly have a very crappy but individual logo (like 90's clipart). The host sites all have high DA/PA due to some very extensive link spam pointing to the sites, with very targeted keywords. There is seemingly no purpose to these sites that I can see - no other 'followed' links on the page or site. Whoever is doing this is churning out tens, if not hundreds of these sites. Any ideas what might be going on here, and whether I should be disavowing these sites (even though no follow). The fear is that they could switch the links to do follow, and get all the major players penalised in one fell swoop. ???