And this is one more reason not to use software which is free. From customer perspective: If you are using something which is free then they will try to SPAM y

And this is one more reason not to use software which is free. From customer perspective: If you are using something which is free then they will try to SPAM you as much as it is allowed by law. From company perspective: If you ran a web service (SaaS or something) and you have "free-loaders" using your service, they will mark as spam all your legitimate emails.