"A phone number is nothing you can just keep. Also i OWN my emails domains." I don't get the distinction the author is trying to make: if you stop paying the renewal fees for them you'll find you "own" those domains exactly as much as you "own" a phone number.
Having a phone number and a domain actually have way more similarities than I think this guy wants to say. You don't own your domain, your registrar does and you are leasing it. Sure, generally you go year to year instead of month to month, but in the end you don't own your domain either. And it's way easier for someone to target you.
Sure it is not _mine_ ether. But it is more mine than a phone number ever will be.
Edit:// I tried to look it up, except trademark stuff (and even then its not easy) i dont see any reason a domain could be taken away from the renter while beeing paid for.