The way I see it is that cartoon network in the U.S had not been well managed as it's foreign counterparts especially it's live network.
You couldn't have said it better. The U.S division of Cartoon Network has awful management; they gave shows little to no advertising, unexpected hiatuses, and removing shows with little to no explanation with a ridiculous statement stating "they didn't sell enough toys". I'm looking at you: Young Justice, Generator Rex, Thundercats, Sym-Bionic Titan, Beware the Batman, and various others. It's no wonder they have a huge list of their shows on Screwed by the Network on TV Tropes.
Thankfully the former is getting a third season (possibly more) and it's going to be shown on a streaming service so they won't have to deal with their garbage.