To Unsubscribe a Subscription: a Prohibition?

Seeking more information about a web site, which I believe to host some of the highest-quality educational material for aspiring Web Developers, I found the following paragraph nestled into its Terms of Use.

You understand and agree that our Services may include communications such as service announcements and administrative messages from us or from our partners and that these communications are considered part of the Services. You will not be able to opt out of receiving these messages. You also understand that our Services may include advertisements.

How do you feel about the terms quoted above? Do you know what entity is referenced as “…the Services…” above; which entity imposes these terms, or where you might find similar terms imposed upon you?

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