With the huge usage that LLM APIs are getting in all sorts of industries, they cannot be going away, and they're cheap.

If consumer AI chatbots get enshittified, you can just grab some open source bring-your-api-keys front-end, and chat away for peanuts without ads or anything anti-user.

I use https://github.com/sigoden/aichat , but there are GUIs too.

Plus, anyone enterprising can just write a web front-end and sell it as "the ad-free AI chatbot, only $10/mo, usage limits apply".