From the 'privacy' policies of petitiononline.com:
A valid email address is required as part of each petition signature. This email address is used to privately confirm signatures. It is not added to any mailing list at PetitionOnline.com, and it is not sold to third parties.
We use your IP address to help diagnose problems with our server, and to administer our Web site. Your IP address is used to gather broad demographic information.
They say nowhere that they do not give
away your e-mail address or simply offer it for free to a "business relation". The fact that they also register IP addresses is also interesting.
Sure, sign and help the spammers. And lets just face it, MS won't even care. Just a bunch of (mostly anonymous) people who sign an online
petition without a guarantee that every vote is from a single individual from the USA. This will only provide a good laugh for one day in Redmond.