He is actually a fascinating story of "making it" in the way he did it. Heard other streamers reference him when they get the question "How do I make it on twitch?" that viewers often have. After a more serious answer, they end with "or you can do what Greek did".
He has always admitted to the way he did it as well. He started when he was living with his mom and had no viewers. Then he started stalking Tyler1 in any game he played except League since Tyler1 was at that time basically the top streamer. Tyler started playing pubg or whatever it was called which had proximity voice coms and in basically every lobby Greek found him and annoyed the shit out of him to the point where Tylers chat found it great when Tyler raged. Eventually though they started playing together and people started watching Greek. Then he started following Sodapoppin and Rekful and doing the same getting to know them and their friend group. Became friends with them and started meeting with them when they travelled.
He went from nothing to 20k+ viewers but grew a very hostile community since it was born from trolling. Once he started getting fit he did a massive purge of his community since the leech days was over and he didn't have to latch on to other streamers to get his viewers anymore.
He is also rumoured to have stolen Pokimanes underwear when he was visiting the house she lived in since he stalked her too at one point.
Now he lives with Sodapoppin and is probably a millionaire.