No, giving my e-mail address is just that - giving an email address; it does not come with permission to send automated daily emails. For example, I login to facebook with my email address, but I have explicitly withdrawn any permission for facebook to send me any notifications by email in all the opt-out settings.

Subscribing to messages should be explicitly opt-in, and in a bunch of countries is legally required to be opt-in. If I miss an opt-out checkbox, and you send a marketing email - that is spam by definition, if gmail decides to filter you out, then by all means it was the right thing to do; and if it was a local business, they would be fined for that.