What does a Certified Veteran's Benefits yst get out of helping my mom fill out VA forms?

My father was a WWII veteran and ex-POW. He died a few years ago of old age. My mother is just now applying for surviving spouse benefits because she went to a seminar put on by a "Certified Veteran's Benefits yst". They help people for free to apply for VA benefits...WHY? What do they get out of it? A mailing list? How do they support a business doing free help? You sign forms allowing them access to all the info you tell the VA, because they are helping you fill out the forms. I'm suspicious. IS IS SAFE to use them? thanks.