GooglePages spam security flaw

GooglePages allow spambots to harvest your gmail account.
Part of your email address is the url to your GooglePages site.
For example:
Someone with a gmail account of jdoe@gmail.com signs up for GooglePages.
His GooglePages url is jdoe.googlepages.com and there is no way to change it.
Now spambots just have to harvest googlepages links and they have valid gmail accounts.