I'm not sure why they ham up the risk of privacy loss regarding unmasking anon players, the only "risk" I can think of would be someone developing and testing new strategies but then I'd assume the fingerprinting would be far less accurate, testing if you can effectively hide your own quirks while deviating from them would be far more interesting. As it stands this is nothing new and the concerns seem weirdly pointed, everyone(?) already knows the risks of fingerprinting and pattern recognition in more general applications. It was a fun paper to read, shame half the article promoting it was cautioning.