Outbound though traffic though is where it hurts: somewhere around 0.15$ / GB, and that's for each and every time any one plays a given video.
1 minute of h.265 would sit around 22Mb (according to the first source I found https://medium.com/@PoloPinetta/youtube-4k-and-h-265-uploads...)
Better get that compression going, and I hope they figure out a way to make some money soon enough, but for a small user base it should be manageable