And they don't ever forward spam, even if you've set up mailbox forwarding to an external address. There's no option for it. So to ever see those messages, I have to use a complicated custom rule to force it to forward all the spam to me, too.
I think it's too consistent and longlasting a problem to be accidental. I think they're spam-holing all class action notices, instead of just Google ones, so that they can claim it's just a general error in their automatic spam filter.