He's a life taker and a heart breaker -

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Short version - He found a little fame by making "Natty or Not" videos and ripping off Bill Starr's 5 x 5 back when "Starting Strength" and Youtube fitness were getting hot. As more people found out he was a coattail riding goofball, he started to develop a fake tough man persona based on guns, powerlifting, and a fake military career.
That quickly fell apart after Layne Norton sued him over a "Natty or Not" video, and Blaha spazzed out all over the internet. It's been all down hill since.
He survives off a huge back catalog of videos (6000+), and a small fitness coaching business, that may or may not make money.