It seems that users will be very tempted to write additional "session" information, for example some kind of visitor id to the logs. They would need that to, for example, correlate which people visit the homepage with which referrer then buy a product. That's a core use of most analytics products.

Considering the raw logs are timestamped and public, that then sounds like a rather large privacy hole for the users.

I would imagine some kind of pre-aggregation happening, and then making available aggregated data instead of raw logs.