We don't share data except via order from Australian courts, so we're not participating in data sharing with either governments or with advertisers/data miners.
Our whole business model is money in exchange for service rather than having to monitise the data that's stored with us. Among other things it means we don't want to keep eyeballs on our site - the quicker you can deal with your email and go do something else, the fewer server resources you use!
We do participate in spam reporting feedback channels - such that are part of email deliverability and abuse detection of course, but that's about behaviour on the MX side, not about customers. Our list of "badly behaved IPv4 addresses" is quite extensive!