Is it illegal to be self-sufficient and live in seclusion in the mountains and cut down trees to open up wasteland?

This is illegal. At that time, my parents operated like this: a few meters were cut off every year on the edge of their contracted land, and the forestry station intervened and said that it was only to repair the land. Ten years have passed, hey hey, boy, the contracted land area has expanded a lot. Cut the mountain in half, you will be punished, fined and detained.