They are largely posturing, even including the arms race and airspace incursions. The risk of ruin of a direct confrontation of th PRC and the USA in a hot war is infinite because the USA reserves the ability to launch pre-emptive nuclear strikes which the PRC would retaliate.

Taiwan buying US equipment yields $$$ for the US. TSMC building fabs in Arizona yields $$$ for TSMC and the US. China selling manufactured goods to Taiwan and the US yields $$$ for China. Media/influencers writing panic-bait to hype up engagement metrics yields $$$ for content creators and shareholders. $$$ is the only thing that matters for every entity involved in this situation.