There would still be ways to disable it - rename the script in /etc/cron.daily, use the 'crontab -e' command to comment it out, set the daemon itself to non-executable... unless they hardcode it into the kernel there will likely always be a simple way to render it nonfunctional.

That said, I really doubt that Canonical will do such at thing, at least, unless they get bought out.

Just use Synaptic to uninstall the canonical-census package and be done with it.

This license might work just as well for that: Creative Commons by attribution/non-commercial/share-alike (v3.0)

Those who scoff tend to lack the imagination to do anything along those lines, or lack the confidence to build their skills up to the point where they are capable of doing something interesting, new, and innovative. It's far easier to bust someone's chops for "dreaming" or "being unrealistic" to cover the fact that the naysayer has balls the size of peas (if applicable) than it is to get off of one's ass and do something.

I'm concerned about what would be done with the information. I'd feel a hell of a lot better if I had any assurance that the company doing the work wasn't going to sell it or give it to someone else for archival. I'm also concerned about my health insurance company getting a copy of the data, analyzing it, and thereafter deciding that my coverage should be dropped entirely rather than staying at sucktacular because there is one gene they decided that will cost them too much in the long run.