In fact, most people use it as a platform to livestream themselves playing video games, although in recent years Twitch's IRL (In Real Life) brand of content has been growing.
Meanwhile, an audience would comment on their appearances and conversations.
"I try to capture the natural interactions between myself and the passengers - what a Lyft and Uber ride actually is", Gargac told the Post-Dispatch.
Some riders told the newspaper their privacy had been violated and they didn't know they were livestreamed and wouldn't have consented.
As he operates in Missouri, Gargac's actions are legally sound.
Reached for a response, Twitch wouldn't comment directly on Gargac. Uber said in a statement Sunday that it had ended its partnership with Gargac and that "the troubling behavior in the videos is not in line with our Community Guidelines".
While Missouri law allows a person to film another without their consent-so Gargac was not breaking the law-Uber has nonetheless chose to suspend him from their app, calling the revelations "troubling", reports Business Insider.
"The safety and comfort of the Lyft community is our top priority, and we have deactivated this driver", a Lyft statement said.
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On Saturday morning, Gargac tweeted that to him, "transparency is always key". He added: "I love doing it".
His story appears to be full of contradictions. He started driving in order to record and broadcast people.
Uber has suspended a driver after he secretly livestreamed his passengers' journeys on video-sharing website Twitch.
"We're really dealing with a law that was developed just during the time of audio recording", Stewart said.
'This better be content, I swear to God. He said victims could theoretically sue for invasion of privacy, but "would need to show that the back of an Uber is a place where we can and should be expected to be private".
During the live-streams, thousands of Gargac's viewers would offer real-time commentary on the passengers, which were mostly women and sometimes even children.
But here's the twist: It's completely legal, despite ethical questions raised regarding passengers' privacy.
Ride-hailing services have previously come under scrutiny for the behavior of their drivers. But Twitch's community guidelines expressly prohibit content that violates a person's privacy. Before his channel was taken down, Gargac had 4,500 followers and around 100 subscribers, who paid $US5 a month to watch his uploads.