Thanks for the answer. Imo this shouldn't be the default setting, it's very strange, especially after I clicked unlock, the app doesn't respond as it should.
Discussion
Yep, the lack of UI change is a bug. But it is definitely gonna stay as the default. It does work quite well, specially for new users.
But this dude is not a spammer. And I never received 5+ equal messages from him. And I literally pressed the unlock button, but Amethyst decided that it was better for me to decide to block it again many times. This is very strange