As well as harming it's users and then getting sued, the economics of it all just didn't add up.
https://www.404media.co/character-ais-bankruptcy-documents-show-the-economics-of-ai-dont-work/
The company said that in 2024, the company spent $13.8 million per month on AI compute; in 2025, it spent $10 million per month on AI compute. The company’s subscription revenue peaked at $2.8 million per month, but at times was less than $1 million per month. Its revenue from all sources, including ads, has peaked at $5.3 million per month.