Same experience many websites scrape images and content and spin them and link back my website. I don't think it makes any negative effect.I'm still puzzled about this subject.
My several big adult sites are heavily targeted with that specific scraping method by at least 50 identical sites that scrape all over the adult sites, mine and hundreds more. They simply snatch pics with alt texts and titles and link back via url.
I don't know how that affects my rankings but definitely doesn't do anything positive.
I also don't know what is the purpose.. blatant negative seo or some invisible monetization method. Those scraper sites DO HAVE some ads but I doubt it makes the grand scheme worthwhile.