This is not a culture thing imo, being honest and transparent makes you vulnerable to exploits, which is often a bad thing for the ones being honest and transparent in a high competition area.
Being dishonest and cagey only serves to build public distrust in your organization, as has happened with OpenAI over the past couple of months. Just look at all of the comments throughout this thread for proof of that.
Edit: Shoot, look at the general level of distrust that the populous puts in politicians.
