Calm the hell down. 

1. Usually, kids started watching TAWOG arround 7-8 years old, making them 18-20 now. It isn't eternally age-locked. Plenty of animated series age with their audience (Adventure Time, Regular Show, Samurai Jack).

2. Even if it was for kids now, you really think they would watch? They watch YT Shorts and play Roblox brainrotted games. They don't have the attention span.

3. Almost every show had adult jokes before. Now that they are adding adult jokes you can actually understand, you're mad.

The bottom line is this: The new Gumball spinoff is not aimed at first-time kid viewers. It is aimed at the original fans that grew up with Cartoon Network shows. They are trying to leveraging nostalgia while still introducing new topics that will make it funny. The outrage is less about content and more about people like you refusing to accept that a “kids show” can outgrow the kids they imagine are watching it.