my guess is openai spent the most human hours fine tuning the model, and other companies are running into problems and trying to deal with them whereas openai already learned those lessons a long time ago
This is not true. For LLM data labeling, the knowledge workers are very well paid. The hourly rate is way above minimum wage. The questions oftentimes require domain knowledge. They are complex enough and cannot be answered by random person on the internet. AFAIK most of them are located in US.