Drawing a bright line between research vs products and considering only the former to be "innovation" is a way to become quickly irrelevant.
Microsoft has been doing, like, negative innovation and is still relevant.
If you need 10B dollar to develop your product you have to find it from somewhere. Training an LLM is not something you can do in a garage, bootstrapped.
What would they have done instead? They still need to fund the operation somehow, and raising money is a good way to build partnerships.
If you were sure it will be a $1T business you have more reason to sell equity and accelerate the growth of your company, because you know the remaining 50% is going to be so valuable.