How is this different from all the other online services that require you to click a link in an email in order to verify it, and refuse to give you full membership until you do so? Some of the registrars I use have implemented this policy lately. Turns out it's a non-issue as long as your contact info is valid and up to date (which it should already be). It doesn't conflict with whois privacy, either, contrary to all…
No, why should domains be required to attached to an individual person?