[rodnim]

> you can sign up to each service with a unique email address, e.g. <microsoft>@<your-domain.com>, which makes it easy to see if any services ever sold your address

You don't need your own domain for that. Gmail (and probably the other big ones) support it as well, just add a plus sign and whatever after your username: [e-mail] will end up in the inbox of [e-mail].