This happens to all of my blog posts - on dozens of "aggregator" sites. Some, like Outline, are happy to offer an opt-out. But the rest are just SEO farms - lifting content and passing it off as their own.

I occasionally report them. If they're hosted in the EU, I'm usually successful in getting them taken down. US hosting companies just don't care. Chinese & Russian companies don't even answer emails.

It's rather frustrating.