Earlier quoted context omitted.
Their stock is falling because of future demand issues coming up with the whole semiconductor industry. Just this week, expanded export bans to China were announced and are an uncertainty on how much volume will be impacted in the future, because no one knows what will get an exemption or not.
Also the long-term uncertainty of Taiwan's political situation will continue to weigh on TSMC's stock price. For example, investors may be afraid that there might be some ominous signals coming at this week's National Congress of the Chinese Communist Party, held every five years.
Republic of China move to Taiwan since 1945. that's over 70+ years. that's one person born and into retired age.
you can question every country on Earth for its long term uncertainty. North Korea constantly shoot off Nukes. Russia is invading Ukraine now. Saudi and Yemen.
American just recently left Afghanistan to Taliban after 20+ yrs of Nation building.
70+ yrs peaceful times in Taiwan with some up and down with China seem pretty stable to me.
https://en.wikipedia.org/wiki/Taiwan#Republic_of_China_(1945...
edit: even USA have some long term uncertainty after Jan 6 (United States Capitol attack or protest?) Trump-backed election deniers is about to be elected into the US Congress.