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In the US you can opt out of the majority of junk mail from creditors and insurance here - https://consumer.ftc.gov/articles/prescreened-credit-insuran...

Yes, for those looking to do it themselves, there's a how-to guide on the blog: https://blog.talktomel.com/blog/7-ways-to-unsubscribe-from-p...

I wish this actually worked

It does. I did it years ago and have not received a single unsolicited credit offer from a company I don't already have a relationship with.

It absolutely does work.