Same here, Google unpublished one of our 10 million+ downloaded apps without warning. I appealed using the option to upload a PDF file to have a 2 page description of our processes and efforts to deal with user generated content, only to get the standard canned response "We (...) will not be reinstating your app. This decision is final (...) We are unable to comment further on the specific policy basis for this removal (...)".

Needless to say, this is a very disappointing way to be dealt with when this concerns a significant revenue stream.