He's been doing it a long time. You can listen for free on a few different platforms. He's been kicked off of all the suspect places (which to me says something) He does have a paid subscription available but you don't need it. It is not very expensive if you want to get some extra material from his website. I think he is 100% legit.

Here's a fun thing to do. I like to slow the video down and listen to what my wife and I call drunk Dave. Sort of juvenile but it makes me laugh after a long day.