I was being overly sarcastic in my prev comment. There is no reason for them to do it. In fact if they did, it would be considered a loss of value. Its valuabl

I was being overly sarcastic in my prev comment. There is no reason for them to do it. In fact if they did, it would be considered a loss of value. Its valuable dataset. Even deleting stuff in 'big data environment' is generally considered too expensive rather than just un-indexing data points that are not relevant anymore.