If they did that, they don't deserve a second chance at trust. That is outright malicious, and definitely a dark pattern. Their app deserves to be deleted and not used again.
Oauth2 has some serious holes - I have no idea if the Google login page is served by Google, or is simply a copy of their landing page designed to phish for credentials. This needs to be fixed as Oauth is becoming increasingly prevalent. We need some type of web of trust like SSL EV that gives me attestation the Oauth login page is being served by the company that I think it is.
