[MereInterest]

Honestly, I'd classify those as spam, without any additional qualifications. Giving my email address to a service is permission to send emails related to that service. It is not permission to send advertisements for other services, nor is it permission for affiliates to send advertisements.

Recently, I gave my email address when having my car serviced. The next day, I received an email from Sirius XM, because the shop has a partnership trial deal with Sirius. I marked that email as spam, because it was entirely unrelated to any legitimate use for which I had provided the email address. That it was being sent by a legitimate company doesn't change the fact that it was spam.