So the top-most entity is the Mozilla Foundation, they control and dictate what the subsidiary, also called Mozilla, can and cannot do. The OpenAI foundation cannot dictate what OpenAI Corp can and cannot do.

1. Mozilla isn't working in a capital intensive domain like Transformer Tech unlike OpenAI so there is no need to bend over demands this much.

2. Mozilla Corp is fully owned by Mozilla Foundation. OpenAI Corp was created by the OpenAI non profit to take external investment. The OpenAI non profit chose to give chunks of the OpenAI Corp to investors because it needed money. By selling stakes, they gave control of the company away. That's the difference.

3. OpenAI Corp answers to their stakeholders of which OpenAI foundation is only one and a minor stakeholder. Mozilla Corp answers to Mozilla Foundation only. That's the difference.

4. Presentation. The mozilla websites for the foundation and the subsidiary both use the org domain which is used by non profits, unlike openain's com use. Not a rule but a choice in presentation.

There is no comparison here.