The registration limitations can be arbitrary. For example, I was excited to see that my city had signed up for a domain, but in the application they say the do

The registration limitations can be arbitrary. For example, I was excited to see that my city had signed up for a domain, but in the application they say the domain will be closed from public use and that they will delegate names only to official departments of the city. But I guess if you are planning to make a commercial operation around a gTLD, its best to let anyone register.