No confrontation here, you know I always appreciate your help, and I'm just talking here :)
That CAN-SPAM act talks about sending unsolicited emails to "members", which there has to be a way to opt out of. It doesn't say that a business can just mine an email and put you on a corporate marketing list. Not to be crass, but the law was in no small part based on the way back when people used to get totally unsolicited "adult-themed" emails, and people were understandably offended. But the law, I believe, applies to all business email marketing. I do not claim to be a lawyer, so maybe I'm wrong, but I stand by that it's unethical at the least.
Oh, I'm mad at Opensend too lol! But I'm just as upset at the business who decides to use it. And I know, someone will reply that "everyone" does it, which, for one, is not an excuse. But it's also simply not true, as this is the first and only time this has ever happened to me. No other site have I ever just visited once for a couple of minutes, and then was "automagically" signed up to their email list. If this was a widespread thing, my inbox would be packed full of garbage I don't want, but it's not (yet).