I’d say somewhere around half of the marking emails I receive in the USA have one-click unsubscribe. It’s still very common to have unsubscribe links that require you to enter your email address and then select that you actually want to unsubscribe from everything, etc. And some of them still require logins, although those are getting rarer. Not sure if it’s actually a loophole, but one of the dark patterns I’m seeing often is one-click unsubscribe generally only unsubscribes you from a very specific type of notification or topic of the mailing list, and you’ll still get other types of emails unless you fully log into your account and go in your email settings and unsubscribe from everything. Not sure exactly how Google and Yahoo treat those, but it feels kind of like marketers found a loophole that seems to work for them.
Github unsubscribe is behind a login. Very annoying. We have an account with a company e-mail that is an alias to admins and it was subscribed to a few issues. One morning I got so annoyed with Thunderbird's not working message filters that I took the time to look up the password, login, unsubscribe and disable all nuisance e-mail communication.
I also get a fair number where there is am unsubscribe link, but it doesn't work. Or I unsubscribe and then a few months later am somehow resubscribed. It might be malicious. But I think in many cases the cause is just that the company doesn't really care that much, and don't prioritize fixing the unsubscribe flow if it breaks.
