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1. P2P doesn’t give Google all that juicy mineable data that they get when everything you do makes round trips through their servers.
2. This would also implicitly encourage Android users to rely more on services like Google Drive/Docs for all files, which is good for them.
Edit: Apparently it is disputed that iOS has superior P2P file transfer support vs Android (see reply below), so perhaps all this is a moot point. I was assuming the truth of the parent post, and didn’t realize it was contentious; and since I’m not an Android or iOS expert, I can’t really argue that topic either way.