when did this switch happen? 
Discussion
Why do you assume it "switched"? China's population is 4 times larger than the US, yet their BTC capitalization is only what, 50% larger?
In any case, M2 inflation rates since 2020 probably have a lot to do with their current respective valuations.

The original list of shitcoins
When you realize almost all of these individually are worth more than 21M Bitcoin.
Few.