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They're probably expecting their email provider to take that info and use it somewhere upstream of their own individual account.Report spam, as a generic feature? It's an okay starting point "as-is" but useless for preventing malicious use and it hasn't meaningfully improved since launch.
Specifically for google: allow users to block whole domains; I can already do that on my own mailserver, why can't I do that on Google's? Then, block mail from foreign countries -- or at least countries that I don't care about; I can block whole ASNs on my mailserver, why can't I on Google's? That then leaves only mail that I can bring legal action to.
Another iteration: when you "unsubscribe", then keep a record of it, and also show the history of emails that you've received from them on a confirmation dialog. Show me anything interesting like purchases, warranties, appointments, etc. When confirmed, keep a record of it. Show me a list of _all_ of the things I've unsubscribed from. If email is still received, automatic report spam and block the domain. Oh, that means that mailing lists must come from the same domain that sales are made on.
Another iteration: a subscription should require a confirmation. Let the email server recognize the confirmation, and block emails whose unsubscribe links aren't in the list of confirmations. That means an unsubscription link should go to the same domain that a subscription was confirmed on.
That's just a few spitballed ideas. Spam reporting functionality is clearly iterable, but it hasn't meaningfully changed for decades. It's still primarily done through opaque "reputation" scores and little else.
I don't want "report spam" which doesn't give me feedback and continues to let spam onto the wire to my client, and isn't powerful enough to use to block bad actors from trivially getting to my inbox. I don't want to be expected to (and trained to) click on unverified links which take me to somewhere I don't recognize, and could take me somewhere malicious. I expect more from the largest email provider(s) in the world.