I like The Trainline, a booking site for rail tickets. But every time I use them I get fooled by the 'Continue' button on the last screen. It takes you to a 'partner website' - ie, an advertiser who wants to sign you up to something.
I don't use The Trainline often enough to remember that this is a con... and it gets me every time.
I hope they're making a little money out of it as compensation for the loss of customer trust. This kind of functional impersonation is pretty close to phishing.