Here’s a list of links to web forms owned by antivirus companies to report scam domains to. Avast just replied to a tweet I made to them about this. Antivirus companies are our allies in this fight. Oh! And if you see a scam call center pretending to be an antivirus company, report that specific scam to the antivirus company in question.
https://www.avira.com/en/analysis/submit
https://safebrowsing.google.com/safebrowsing/report_phish/
https://safebrowsing.google.com/safebrowsing/report_badware/