A lot of negative comments here, so I'll offer my 2c.

I agree that their initial post was deceptive, and inexcusably so. But the spammy tactic I think is outweighed by their total devotion to understanding their customers. Maintaining over 300 simultaneous conversations, just to get an insight into their users is a herculean, and praiseworthy, effort.

The takeaways and tips are useful too, if you're thinking about starting a bootstrapped company. They're not pitched as "do this and you'll succeed", they're pitched as "here's what we did, you do you", which I appreciate. I'll borrow some and ignore others when I start my own venture.

EDIT: curious why I'm being downvoted