I’ve noticed an uptick as well. This isn’t the first time it’s happened over the years, though. Spam is a cat-and-mouse game. Every now and then spammers learn how to break through, and it takes some time for Google to adapt.

I’ve been surprised by the latest wave, because it’s so obviously spam. Mostly phishing attempts full of misspellings and even numbers in place of letters, like F1del1ty instead of Fidelity. Should be pretty easy to filter.