AI systems such as ChatGPT are notoriously costly for the companies that run them, and so giving detailed answers to questions can require considerable processing power and computing time.

This is the crux of the problem. Here's my speculation on OpenAI's business model:

1. Build good service to attract users, operate at a loss.
2. Slowly degrade service to stem the bleeding.
3. Begin introducing advertised content.
4. Further enshitify.

It's basically the Google playbook. Pretend to be good until people realize you're just trying to stuff ads down their throats for the sweet advertising revenue.