I’m a bit on the fence with this one. Sure, spam is bad, but they also enable you to reach out to somebody outside of the LinkedIn’s walled garden (personally, without automation).

If it enables a tiny startup trying to solve the exact problem I have to reach out to me – I’d say it’s a net positive (but not by a huge margin), and having to blacklist @mongodb.com with their certifications bullshit is a price I’m ready to pay. If more spammers get their hands on this kind of dataset though it’ll probably be a disaster.