If they are wildly successful they were most likely born rich like the vast majority of wildly successful people. That would be the environment where they can succeed despite barriers. ADHD does not promote effort, the inability to stay focused and succeed is one of the criteria.

ADHD does let me think creatively about stuff because my mind races about all the possibilities and make uncommon connections, but that is because of all the coping mechanisms I have had to develop while working in a society that absolutely crushes people with the symptoms of ADHD. If autopay wasn't a thing I would be missing bills constantly for example, it is a work around for the tediously large number of things that society expects everyone to remember and manage.