If he asked for permission and used a better voice (like by using Vocaloid), and when he didn't ask for permission it was only of major published works that will get more attention in a month than all his channels will ever get I wouldn't care. But he doesn't ask for permission and the voice sounds like Twitch TTS.
Also, a meticulous viewer keeps track of every interesting video in an external document. I have over 3,000 with at least the title and URL.