“If you just sort of say like go make me a website, like almost every model is going to default to doing React and sort of lean that direction and then probably tell you to go to Expo too.”

Software defaults to React because that's where the training data is

LLMs reinforce whatever has the most open-source examples. React wins websites by default; Expo wins mobile by default. For developer-tool SEO, this means tooling adjacent to the LLM-default stack gets surfaced for free in every 'how do I' answer the model generates — earning AI-default status is now a distribution channel.