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To run that type of attack they would have to go through an end client. Meaning they would have to access to your machine, most likely through a rootkit, or the VPN servers, by hacking directly into F-secure servers. If they are already on your end client then a traffic analysis attack is the least of your worries. Also, the likely hood of a succesfull traffic analysis attack on F-sercure's server is unlikely to even happen, let alone last long enough to get any useful data.