OpenAI probably doesn't feel the need to pay to win publicity right now—they've been in the spotlight for as long as LLMs have been a thing, and GPT-4 is far ahead of competitors' offerings.
It’s about trust - not publicity. Trust is hard to earn back once broken, and there will be multiple offerings eventually.
For example, AWS was one of the first cloud providers. Now there are alternatives, but I still pick AWS because I trust them not to break my dependencies way more than, say, Google
