Kurama was created from the Ten-Tails chakra to maintain peace, but due to the greed of humans, he was sought after for his massive power.

Source: https://www.cbr.com/naruto-characters-worst-endings/

Serving as a pivotal factor in the unending conflict between the hidden ninja villages throughout the series, these nine chakra monsters have been used as weapons by warring factions and individuals in the ages since their creation from the Ten-Tails.

Source: https://gamerant.com/naruto-the-tailed-beasts-explained/