Because google only pays Mozilla because of:

• Maintaining search dominance

• Preventing anti-monopoly scrutiny

They don’t want Mozilla to compete in any AI space, because there’s already a ton of competition in the AI space given how much money gets thrown around, so they don’t benefit from anti-monopoly efforts, and there’s so many models that they don’t benefit from search dominance in the AI space. They’d much rather have Mozilla stay a non-AI browser while they get to implement AI features and show shareholders that they’re “the most advanced” of them all, or that “nobody else is doing it like we do”.