Iirc its just the vanilla Xcom rules - once the Alien Infiltration (Zero Tolerance for XPiratez) mission is generated one of the region countries is gone from funding at the end of the month, and hostile faction base spawns there.
Being able to interrupt those is relatively recent addition, and is implemented as a %chance to deny the mission whenever any of mission UFOs are shot down.
At least thats how I get it, and I do take a long breaks from following all the development.
I suppose. Still I was only asking a question, there's no need to be rude. I'm just trying to have fun the same as everyone else.
Please, do not take offence, its just that whenever any project goes wide there will always be haters (it just happens), and creators have no choice but to sharpen the edges to stay sane. Do not take it personally.