Even lowest level fast food workers can choose a different employer. An engineer working at OpenAI certainly has a lot of opportunities to choose from. Even when I only had three years in the industry, mid at best, I asked to change the contract I was presented with because non-compete was too restrictive — and they did it. The caliber of talent that OpenAI is attracting (or hopes to attract) can certainly do this too.
Only thanks to a recent ruling by the FTC that non-competes are valid. in the most egregious uses, bartenders and servers were prohibited from finding another job in the same industry for two years.