Having enough scale to perpetually offer free/low-cost compute is a moat. The primary reason ChatGPT went viral in the first place was because it was free, with no restrictions. Back in 2019, GPT-2 1.5B was made freely accessible by a single developer via the TalkToTransformers website, which was the very first time many people talking about AI text generation...then the owner got hit with sticker shock from the GPU…
Charity is only a moat if it’s not profitable.
So GP point still stands. FAAMG can run much larger immediate deficits in order to corner the market on the eventual profitability of AI.