Angels in Everlasting Chains?

Who are these?

2 Peter 2:4 KJV — For if God spared not the angels that sinned, but cast them down to hell, and delivered them into chains of darkness, to be reserved unto judgment

Jude 1:6 KJV — And the angels which kept not their first estate, but left their own habitation, he hath reserved in everlasting chains under darkness unto the judgment of the great day.

Why aren’t they free as the others? Yaani evil spirits?

Those who rebelled in heaven and slept with the daughters of men