Network traffic analysis/DPI strikes again. I wonder how many people think that their VPN usage obscures their identity, when the flow of traffic at certain times gives X% probability that this person visited the site based on the timing/size/speed/length of each TCP stream, increasing in confidence every repeated visit. Hell, how often will someone download a file of exactly 7060378032 bytes? It may not be damning evidence, but it'll surely put you under suspicion; sometimes that's all it takes.

I'm looking forward to when VPNs always throw up chaff traffic.