As shown in the YouTube video below, this is a good measure to prevent accidents that may happen during the typhoon season in the Philippines that happens from June until December, practically half of the year.
However, as shown in the video, the man working on the tree is not fully protected. He should wear protective clothing like hard hat and gloves. We'll never know when accidents may happen.
Also, the branches should be cut before the rainy season begins so that it will be easier to manage.