It seems Taiwan strategy is the following: build as much capacity as we can and bound to us as many customers as we can (especially US customers). Is a strategy that makes sense from their point of view, don't know if it will succeed, with China and US building up semiconductor factories for geopolitical strategic reasons (i.e. build them up anyhow, no matter what) we can foresee a big capacity surplus in the market in few years from now...interesting times ahead! Not everybody will survive...
It make sense to me. For self preservation, TSMC should expand as quickly as possible because :
SCENARIO 1 : With the dominant technology and capacity, the US will probably not allow TSMC to fall under China's control. Hence the US may strongly intervene in any attempt by China to reunify with Taiwan.
SCENARIO 2 : If China reunites with Taiwan, TSMC's capacity and capability will be a prize catch. China will likely handle TSMC with kid gloves, and possibly with Taiwan too.
TSMC is just playing both sides of the coin. IMHO, TSMC should be more worried about the US and DPP destroying it than China does.