This is specifically a way to email writers of (tech) blogs, craft a pitch for them, then email them in a personalized way at scale.
I'd argue that the people we're pitching want to be pitched - it's actually a part of their job. We're just doing it at scale as a way to save a lot of time.
> Is it okay to find users from Craigslist to tell them about your startup too?
I know you're joking about this, but I'm pretty sure Airbnb would have failed without doing exactly that.
At the end of the day the ethical line is one you need to draw yourself. But IMO if the people you're emailing expect to and are OK with receiving email pitches from you you're well on the "ethical" side of the scenario.
Ask (almost) any reporter: They want to be pitched.