There's a legal issue, and a practical issue. If you witness a crime, you can inform the police and something may happen. The FBI does actually investigate criminal copyright infringement, but they also don't respond to concerned-citizen complaints, only complaints of copyright holders (and not all of them). You cannot use DMCA takedown to get the service provider to remove the content (or shut down the site, or whatever would be necessary), since only the copyright holder can make the required sworn statements. So you have no legal recourse.
A practical solution is to tell Google. This link could have been a way to inform them, but it seems to always resolve to identifying plausible DMCA takedown requests, and if you truthfully answer the "are you the copyright holder" question, you are told to go away. Even if you lie at the preliminary stage, the procedure ends with you making a sworn statement, and you can't lie on one of those.
This information might allow you to send them a letter, which they might read. They might simply not consider it worth their time.
