This should be clarified to explain that MS is only killing their version of custom GPTs (which run OpenAI tech under the hood). It is still possible to make and use custom GPTs with a subscription to ChatGPT directly from OpenAI. (A few examples of mine.[0])
The reason is simple: Most custom GPTs are crap and the idea that consumers will create a viable market out of them is nonsense. LLMs are not a way to avoid programming. They are just another way of doing programming, and naturally that requires the same skills as other kinds of programming. No consumer market for highly-sandboxed LLM software will arise out of such an offering.
Title should read "Microsoft kills off consumer version of Copilot GPT Builder after just 3 months"
It will probably kill off the commercial version in due time as well