I develop a commerical app in android studio and in my project I use some libraries that have MIT or Apache license.
What could possibly happens if I don't attribute the libraries that I downloaded from Github and modified the libraries according my uses in my app? Does my app get removed from the Google play store?
The only way you are legally allowed to distribute the libraries are if you comply with the terms of the license(s). Both the MIT and Apache licenses require that you attribute the libraries (and other restrictions), so if you do not attribute the libraries then you are committing a copyright violation.
We're not the people to tell you what Google might do if your app is a copyright violation, but they certainly won't want copyright violations to be available from the Play Store. On top of that, the copyright holders of the code you are distributing illegally could bring a court case against you.
Of course, the obvious way to avoid all this is to ensure you are complying with the terms of the licenses for all code you're using.
