When a country expires

recently a 75 % tax country expires so I did not buy . Then it changes the tax to normal rate and burns down all the mining corps and problably a bunch of other ones

yes

why not instead gmaster takes the mining and the air tran and the others get burned. It would really help gmaster cash problem

The country is reset. Most of those corps won't have the workers to keep them running. Over time it would actually hurt the GM cash problem (like it could be worse).

Yankee is right.
Once a country is reset, the population cannot sustain many corporations.

I think he's saying that the reset system should keep the more profitable corps, as it seems they either close random ones, or are mostly keeping the worst ones.

I've tried to leave good corps in C3s in order to help with scarce things, and build income. The reset always gets rid of the good ones, and builds something crappy.