Sure, some folks lie, embellish, etc. to forward their agenda. See it all the time, others tell the truth and people don't believe it because it challenges their beliefs. Some tell the truth and others jump quicky to discredit the truth teller because it may impact their own vested interest.
Heck, I've had someone tell me straight up that they defend a certain agency from any negative criticism and will try to discredit the person that is doing so because they were an instructor for said organization and the organization's brand reputation was important for them to get business.
I have first hand experience with DAN messing up, and first hand experience with them doing amazing. I have endless second and third hand stories of both, and the good outweighs the bad and I would recommend (and do) DAN insurance.
Let's be frank, dive pro's may be quick to jump to defend DAN because they make money with DAN. By being an instructor for their programs to pushing trip insurance. Other may because they had good experiences with. I have never been a DAN instructor nor taken a commission for selling their trip insurance. I HAVE pushed students to have, and require it for tech classes (or diveassure).
Commission for selling DAN Trip insurance