The other issue at hand here, is "ownership" if you will, of intellectual property, since Android is open source, no one can claim to creating the OS, just their modification of it, which is fine, it is still intellectual property. Now, I understand that Linux is shared openly, and many developers exchanged ideas and code with one another, etc .etc. Nonetheless, credit needs to be given where credit is due. Egos play into the developer community as much as they do in any community of artists. I spend much of my time dealing with artists, as I am a photographer (amateur to be sure, but a good one nonetheless) I know how artists get possessive of what they create. Programming is no different, in my opinion. Creating some of things that I have seen on this site takes some time, and effort, and not just a little creativity. When anyone works hard to create something, and then allows it to be used by others, giving credit and acknowledgment for the elements that were used is simply common courtesy.
I had a similar thing happen to me, and I see it on the photo site I adminsiter all of the time. We have a large and active Photoshop community within our site, some people like to take the work of others, and use it in their own creations, 99% percent of the time, the Photoshopper askes permission of the owner of the content they wish to use, and 99% of the time, permission is granted, and when the final work is posted, credit is given for the elements used. Someone took one of my photos, and photoshopped it, and posted it as their own work, when it was clear to many members that he had taken one of my photos, and used it. The hue and cry about giving credit was rather loud, and this person, didn't acknowledge what he had done, and the results were similar to what happened here.
Give credit where credit is due, as far as I am concerned, taking someone else's work, and calling it one's own, even if modified, is about as low as a person can get. It shows a lack of integrity, and honesty, and probably even a lack of confidence in one's own skills. In the photography community I belong to, the number one rule is "Give credit when using another's work", those who break it are quickly marginalized, and looked upon as a pariah, unless they correct it. It's not "stroking egos" it is simple courtesy, and honesty, to acknowledge those elements that helped make the final creation possible. Asking permission to use is another big thing too...there is nothing worse than finding that something you created is up for sale on a website by someone else, claiming it is their work. Trust me, it's not fun, and it's a big hassle as well.