You're free to modify the logo on your corporate office, but the app logo is part of the license deal or purchase. On the home screen, it's not exclusively your

You're free to modify the logo on your corporate office, but the app logo is part of the license deal or purchase. On the home screen, it's not exclusively yours anymore, specifically, when it comes to posting message via this logo that are not covered by that license. (We may think of exceptions where an app is specifically about posting such messages, like an iconographic motd, but this is not what's here addressed.)