Kinda - not necessarily on/blocked by default, but a curated, maintained global list available to use, if that makes sense.

My feeling is that by blacklisting like 100 sites you get 99% of the SEO spam.

In practice it should be a winning battle, since it takes time and money to spam site up in ranking and low effort to blacklist it.

I will try this out.

So you're saying Google could clean up the index by simply banning 100 sites?

I don't think it works at the provider level - one person's junk is another person's treasure, and there's always going to be content that could swing one way or the other.

For my typical querries atleast. I haven't tried yet.