Given the relative simplicity of integrating LLM autocomplete into OS text fields (compared to other integrations supported in modern OSes), I would be shocked if a state entity with balls (like the EU) doesn’t introduce laws enforcing that OSes must have open support for third-party LLM/generative text integrations.

That said, that’s almost certainly Microsoft’s short-term strategy until then! And probably part of why Apple made their sudden priority shift towards LLM features.