This is a very depressing attitude. A functioning market relies on information flow, and if this information flow is killed because people are scared, the market stops functioning.
Anyway, there is a solution to this - it's to develop a personal set of red flags and heuristics that you use to weed out bad founders when you talk to them. I have one, and it disqualifies probably 95% of startups that I talk to. Unfortunately, I'm not sure there's any way to build this reliably short of bitter experience. The problem with a general "post your grievances" board is that you don't get both sides of the story. I know at least one person who has posted their grievances publicly on HN where I personally witnessed what actually went down, and their account is nowhere close to what I witnessed.
Trust me, I am going to google you before I hire you and if I see you being a mess online that means you could be a huge mess in my company. As a startup, when every hiring decision matters, I am going to pass on you.