After Apple loosened its App Store guidelines to permit game emulators, the retro game emulator Delta — an app 10 years in the making — hit the top of the App Store’s charts. But the increased attention also brought the threat of legal action, as Adobe targeted Delta for sporting a logo that looked too much like its own.
Honestly I think Adobe is in the right here. The trademarks are very similar and it’s not as if Adobe was trying to shut them down - just change their trademark.
Trademark law is not as vicious as copyright law. If a consumer could be lead to believe that the Delta emulator was an Adobe product because the logos look too similar, that’s a problem, the exact problem trademark law is meant to prevent.