None of Amazon Just Walk Out, Nate or Engineer.ai used GPT-class LLMs.
Pre-ChatGPT (2022)? Sure. Meme applies. Today, it doesn't make sense--the closest comparison for AI's coding output is that of a mediocre offshore IT outsourcer.
I just cut 30,000 in managed services b.c I can self host the solution myself on a 300/yr droplet. The folks that were servicing us in the 2nd year (india) won't have the account now since I can do it myself.