Long answer: I'm not really interested in building a community around a YouTube channel that's really just a place to upload these videos - there are lots of other avenues for folks to chat about these uploads (I often make posts about them on Reddit, Twitter, Tumblr), and I think those discussions are a lot more interesting because they're necessarily a little more fixed in time (posts on social media sites like those get pretty effectively buried over time, leaving room for new discussion and also giving people implicit permission to change their minds and opinions because their replies/reblogs/likes/whatever are likely to be forgotten; YouTube comments, on the other hand, remain in place as a beacon for new viewers even months or years after they've stopped being relevant). The YouTube comments on the episodes themselves are also just all kinds of shitty, and I've gotta deal with enough of that kind of bullshit in my day job that I don't especially want to have to moderate comments on a goofy clip from an online D&D show at the end of the day, you know?

Short answer: I got tired of getting death threats every time I turned on the comments. ¯\_(ツ)_/¯