For Taiwan specifically, they took a gamble. The government wanted advanced jobs and I believe willing to fund it a bit. Taiwanese nationals who had hit the glass ceiling in the US because of reasons moved backed and wanted to start companies. One took the bold bet of being a chip manufacturer that only produced other companies designs, as opposed to being a company that designed and produced. Very odd when it relies on those other companies giving you work. It was a gamble that paid off.
As for risc, it’s open (someone more informed can fill in the better details) so China is betting big on it because it’s cheap. I believe it also takes less advanced chips (nm size) so you don’t have to exactly be on the cutting edge of manufacturing equipment.
It’s a “Black hole” that temporarily sucks the enemy’s units in. Players quickly learned they can send in their units along with the enemies. So the trick is you send in a unit called the Archon which does splash damage. The split second that the black hole ends all the units emerge at the same time in a super concentrated area, so the Archon’s slash damage hits all the enemy’s units at once.
What is Hollow Knight silksong?