A Proton model makes this very simple: full cooperation and handover and virtually nothing to be extracted from the data. Size is somewhat of a metadata, ip connection points and maybe date of first use and when data changes occurred... I'm all for law enforcement, but that job has to be old-school Proof of Work bound and not using blanket data collection and automated speeding ticket mailer.

But I guess it's not done more because the free data can't be analyzed and sold.

This is quite elegant solution.