[techblueberry]

Maybe this is a nuance that makes it “better” but I’m 99% sure that Google login means if so visit a site that supports it, Google will share my email with that site even if I don’t explicitly speaking login. Maybe there’s a workaround these businesses are using to get it? But either way my inbox is littered with emails I didn’t sign up for,

[romanows]

Ah, you meant "sharing my e-mail addresses". Not the actual emails (the email contents) themselves.