Not really a new issue. I have an old Gmail account that I don't use as my primary email anymore. However since it's still attached to some services that use Google SSO I have reason to check it occassionally. The amount of spam that makes its way pass the Gmail filter is on the order of hundreds of emails a week. Fastmail on the other hand seem to do a lot better, generally only 1-2 spam making its way to my inbox a day, and never any legitimate mail marked as spam in the several years I've used them. Even Outlook (which I use at work) seems to do a lot better although it sends legitimate emails to my spam folder more than I'd like. YMMV.