Bitcoin would probably sky rocket if the U.S. and China were at war but it still wouldn't be worth it. Having two of the largest economies within a war would destroy global shipping logistics and send the global economy down the gutter. The Ukraine/Russia war caused the European energy market to destabilize for the better part of 6 months and the prices still haven't recovered. What would a war with China do?
Too much of the world economy is at China's mercy, unfortunately.
https://ustr.gov/countries-regions/china-mongolia-taiwan/peoples-republic-chinaU.S. is deeply intertwined with the Chinese economy, including trading deficits to the tune of hundreds of billions per year.
Dont think crypto would profit from war. Remember how it collapsed to 4k at the covid outbreak?
People turn their assets into cash or whatever at crisis times. When the economy goes down so does the value of everything related.