I read some other posts regarding the same topic.
It is looking like nobody know for sure what is the rule - just speculations and own experiences in the past.
In my country, in the 3rd league there are currently 68 bot teams (managed by computer) and also some other are not active for about month.
I am in 4th league and fighting hard for better score because I hope for some openning for promotion for 2nd and 3rd team in my division.
It would be good to know what is the criteria for final decisioin - like table for all 4th league teams where you can see what is your chance to fill the bot in the higher leagues or any other rule that we know what is our goal.