[mhdhejazi]

It'd be totally fine had they respected the license or attributed the project. It's great to know that people use your app and find it useful, and that's why I offered the app to JHU to publish it in their name when Apple rejected it. I'm bothered more by the way the app is published without attribution and how I knew about that.

[pengaru]

Does your app have an About App page or other clearly visible GPLv3 banner containing your name, which they then removed?

[mehh]

That sounds like a fair complaint to me!

[jiveturkey]

how exactly did they not respect the license?

i just don't understand your complaint at all.

[smichel17]

The GPL requires that derivatives (A) credit you, and (B) release their source under the same license.

IANAL but this is not nitpicky legal details; it's the entire point of a copyleft license.