Why hasn't Jeet Kune Do in Bruce Lee been learned so far? Can't you compete with Taekwondo?

Jeet Kune Do is easy to say, but it can be said that only a few people in the world can do it. Attack is defense, and defense is also the best time to attack. It is no exaggeration to say that Jeet Kune Do is a killing skill. Without this talent and persistent exploration, nothing can be learned, so the general public will choose Taekwondo as a crash course. For example, various schools of China Kung Fu have been circulating for thousands of years, but fewer and fewer people are learning it. Even now, most people are unwilling to suffer this kind of hardship. After all, people have to work to get food, and 1 has no time, 2 is unwilling to suffer hardships, 3 has no perseverance in this field, and 4 has no talent, so, ...