Natural language is the most flexible interface. You can easily substitute one service to another service. There is not much lock in factor. It's literally just

Natural language is the most flexible interface. You can easily substitute one service to another service. There is not much lock in factor. It's literally just one API endpoint with variable-length string input, variable-length string output. The main area I can see for lock-in is in the fine-tuning of models for specific customers and problem domains. I think this is what OpenAI is focusing on and why their fine-tuning prices are not as expensive as I expected. They make it cheap to fine-tune but then they charge extra when you use the fine-tuned models (they shift the cost to the customer later, over time after some investment/lock-in has been established). But for most problem domains, it's probably not that expensive to finetune a model from scratch on a different provider.