To weaken the stature of the USA on the global stage relative to themselves. Perhaps decrease US investment in AI and slow creation of some general AI superweapon I suppose.
Because the goal is to show that cheap chinese AI can compete with expensive USA AI, it's nessisarially a low-cost attack relative to the "damage" it could create.
>Why do we think there is a bubble for sure in 2025/2026?
Well that's the position that these chinese firms are trying to convince us of, and they can convince us by undercutting proprietary models in price/performance/openness.
In other words, we can be sure there is a bubble to the extent that open-weight models can successfully demonstrate that there is no moat.
>Why doesn't China also worry about their own AI bubble inside the country?
Because they haven't bet the farm on AI like the USA has.