There is only one thing that TSMC can do and they will do it!
Once President Trump started the war on Huawei, he was going all the way. Since banning Huawei did not work, then they banned all American IP from Huawei, and since that did not work, they had to ban all semiconductors from Huawei, especially the ones from TSMC.
Everyone knows, that at that stage in the game, China will try to catch up, and the window to do IC business in China regardless of US sanctions will be open. Once China catches up to the cutting edge in IC, then that window shuts. Perhaps permanently if a foreign company does not survive.
TSMC realizes now that window is shutting far earlier than they imagined. If they were ignorant of China's IC abilities, then they were ignorant.
This is what TSMC has to do to save themselves.
TSMC has to request a meeting with the emperor, who holds court at dawn. TSMC has to get on it knees and beg the emperor that the Americans made them do it, because they threatened their family's livelihood. TSMC must beg the emperor for some business to stay viable and survive. Their ignorance of China has turned into a corporate life or death situation.
The emperor probably will order some small business will be directed TSMC way. They did help Huawei stockpile chips, and left the US automakers with none.
TSMC already pleading with the world for free trade! They saw the future, and they were startled. They do not want to be collateral damage in the US-China tech war. TSMC actually asks the world to do free trade.
Wonder what kind of laugh we can hear from Huawei headquarters?