I think there is a big difference between being asked to play a venue for free, and paying a whole $15 to have their bedroom mix critiqued by a guy who specializes in a niche genre with a chance that their music might be heard by viewers of his channel, who are enthusiastic about the same niche genre. The dude is not out here claiming that playing your music in his live stream is going to win you a record contract or get you to platinum sales. Maybe he thought a whopping $15 wasn't all that much, considering the number of people in his comment section that are continuously dragging on him for having the audacity to inform teenagers that they don't need to drop $4k on a Gibson to have a quality instrument.