Great job!
About Tubi, there are actually way more Korean dramas than Chinese. At least there were for me when I looked (under Foreign Favorites). Maybe it's a region thing.
I don't think it's worth adding to the list, but for completists Xfinity does have a few dramas on its streaming site. I checked and it seems to be just a handful chosen from the handful that Hulu has left now. They also have a bizarre assortment of dramas with episodes missing, all SBS and MBC titles. So to anyone with Xfinity who's curious I'd say to avoid.
MBCClassic is a decent source to add, though, as someone mentioned above. A bit hard to navigate their channel but still manageable.
I wonder is it possible to add some sort of indication of whether the site has free viewing options? From the way the list reads, it might seem to a beginner like you can't watch on those sites without a paid membership, when that's not always the case. I mean, think of the difference between Viki (tons to watch) and Netflix (no access), for instance, but on the chart they look the same. Just a suggestion, since this post will probably draw a lot of newcomers.