Piracy Monitor checks known piracy sites for your titles and author name every 6 hours, and it checks a new book right after you add it. Once a day it also looks for audiobook uploads of your titles on YouTube.
Automatic scans miss listings. Those sites try to block them. Use Manual Search now and then and check the sites yourself.
When something matches, you can generate a DMCA notice from your saved contact email and book details. If a match is wrong, flag it. Those reports are how the matching gets tuned. A notice is a draft you send. It is not legal advice.