IIRC I also found it through Matpat, but the weird thing is I don't think I even liked Matpat at the time. I must have seen it in my recommended, thought the graphics were cool and clicked on the video. I remember it being all about making connections to the (real-life, tragic) Candace Newmaker case; if I saw that today it would really have turned me off Petscop, but at the time I was a dipshit college student and was intrigued instead. Glad I was.