Given your results it certainly seems so. However, I know of quite a few companies who required people to sign up with their email addresses to play their free

Given your results it certainly seems so. However, I know of quite a few companies who required people to sign up with their email addresses to play their free games and then sold their addresses to marketers. Perhaps you wouldn't count that as spam since the emails sent had some substance? Or perhaps you only reveal your email to trustworthy sites and not to free gaming sites and such?