I sometimes use ChatGPT to analyze flaws in arguments or find bias. So far it seems very adept at this task (at least version 4 is). It would be cool to have it do this on an entire news article, opinion piece, or just a selected paragraph.
Another idea: ChatGPT bot that summarizes the day's top stories from multiple outlets with different leanings and combines the angles into single short articles.
Consider building a ChatGPT plugin that helps with language learning, offering vocabulary practice, grammar explanations, and conversational exercises.