

Same thing they gained from invading Hong Kong, they think it belongs to them.
Or as one of my old friends told me while playing Final Fantasy 12; the only legitimate reason to wage war against another country - land.
Hong Kong is already part of the Chinese mainland and was already kinda part of China, but Taiwan is a geographically strategic location that puts both Koreas, the Philippines, & Japan in a tougher position. Even without war it would make trade and travel in the Pacific much harder.
In Japan, firefighting services are paid for directly by the people living in that area.
I typically have to pay ¥10,000 a year ($69 USD) and all of that money goes to the closest fire department.
They don’t check your payment status or anything, but it’s expected of you.
Whereas policing is paid for via taxes like most other countries.