Ask HN: Does trademark infringement mean you're becoming famous?

Yesterday I received an email from Katrin Rampf, legal manager for the Pomodoro Technique® organization: "We've noticed you're using our logo as app icon and twitter profile image. This use of our logo is not permitted. I kindly ask you to read our guideline and make the necessary changes to be in line with our guideline." The app we're talking about is Tomatoes (http://tomato.es). I will change the logo as soon as possibile because I don't want to infringe any trademark but I feel glad for the first line of text from Katrin because she says that "they've noticed" Tomatoes app. I call these "happy problems". What do you think about it?