The only ads that run on the Disney Channel are for Disney shows and sponsors.

If you’ve got TV, go and turn on the Disney Channel and wait for a commercial. You’ll notice a large amount of self promotion and the occasional ad followed by, for example, “Target is a proud sponsor of Disney Channel.” The reason goes back to only 2002. 

In 2002, the channel began to carry commercial breaks within shows, instead of just between them. Initially, all of these promos were for its own programming, and not long after for Disney films and home video releases. The reason for this decision was that the Disney Channel executives felt commercial advertising could confuse younger viewers who couldn’t tell the difference between regular programming and ads. 

A secondary reason was due to the prevention of license fee increases for acquired feature films. Today, Disney is a little bit more loose with the restrictions placed on in-channel advertising, but there’s still a huge amount of self promotion. Overall, it can be considered a pretty good thing, because it’s a partial escape from how much advertising children see. 

(Source)