I think the complaint would be two things, however IANAL

1. Lack of access to compute resource. Microsoft intentionally slowing OpenAI's ability to scale up and grow dominant quickly vs. Copilot, a competing product. Microsoft shouldn't be able to use it's dominance in the cloud compute market to unfairly influence the market for consumer AI.

2. Microsoft should not automatically gain OpenAIs IP in domains outside of the AI offerings that the company was supplying when the initial agreement was made. If it must be upheld the terms of the contract mean Microsoft get all of OpenAIs IP, then it block OpenAI from competing in other markets eg. Windsurf vs. VS Code.