Yes it is disappointing. The UK was a big market for mj and no tv channels want to by the show! The trouble may be the concept of a cartoon appealing to kids and the allegations. I have to admit a cartoon seemed like an of choice when i first head about it. Of course adults like cartoons too but many think of cartoons of being aimed at kids.
MJ was tainted by the false allegations more in the USA than anywhere else in the world, yet they are happy to show the cartoon on a major network.
UK TV, especially the major channels, are notoriously behind the USA when it comes to showing successful programs. The major channel schedules are also full many months ahead - of soaps, reality TV, and cookery shows, mainly!. The minor networks simply can't afford a new release like this.
There is no drama. This will be shown in the UK, or on Netflix, if it's deemed successful and worth paying for.