When did muay thai become a sport?

There is no mention of Muay Thai kickboxing at

You can still become a great fighter. but you might want to start with classes but it takes guts determination and you won't be a great fighter over night it takes years yes they

the ''martial artists'' on here claim its the best with no proof why? cause they are UFC watchers with little to no experience in martial arts or UFC at times. yeah i think it gained