Fascinating! I always thought he was one of those people everyone who is active on my corner of the internet had heard of.
I mean, honestly his titles and thumbnails don’t stand out much, and most of the themes he explores in his videos aren’t something you’d intentionally search for, it just gets lost in the sea of youtubers talking about generic stuff while usually not saying anything at all.
I personally found him through the “This Video has (X) Views” video, (probably the most interesting title on his channel, if not in the whole Youtube), started watching to see how it was possible and at the end I was like “wtf, this guy is awesome” and started bingewatching most of his stuff.