Looks like this video is about firefighting in South America.

Source

But I found something interesting while reading the comments so I looked it up.

1. In places like South America or Mexico, fire departments sometimes use water tank trucks.

2. In the US, there are unpaid firefighters made up of volunteers who reportedly get about $5–$10 per call.

In the US, paid career firefighters and unpaid or part-time volunteer firefighters coexist. As of 2020, about 65% of all US firefighters are volunteers, and they play a crucial role.

High Percentage: A majority of US firefighters—about 676,900 (as of 2020)—are volunteers. They are especially responsible for fire services in small-to-medium cities or rural areas with low populations.

Roles & Responsibilities: Volunteer firefighters are deployed for the same core duties as regular firefighters, such as fire suppression, search and rescue, and EMS activities in their communities.

History & Background: US volunteer fire departments have a long history and tradition, dating back to 1736 when Benjamin Franklin organized the 'Union Fire Company' in Philadelphia.

Treatment: Career firefighters generally receive high annual salaries, overtime pay, and significant social respect, while volunteer firefighters usually serve for free or receive small stipends for expenses.

The US fire system operates with career and volunteer firefighters complementing each other, and this has become an essential structure for community safety.

I guess since the land is so vast and the population is sparse in comparison, they need unpaid firefighters.