Release inactive gamertags.

Inactive spaced gamertags should be removed and released. They are inactive, 100 percent inactive place holding gamertags.

www.ign.com/.../ask-microsoft-anything-about-xbox-one

In this article, Microsoft teases that they may be releasing inactive Gamertags. Is it just false hope?

"Will you be releasing old, inactive Gamertags for use on the Xbox One?

WHITTEN: We’ve released inactive gamertags in the past, but it’s been a while. Stay tuned."

The article is admittedly old, but it is from after they released inactive Gamertags the first time.

Gamertags are released after 5 years of inactivity in the account

Inactive gamertags are released offline after 7 years

There has never been a policy that a gamertag will be released after 6 years of inactivity. However, there is a rule that states a gamertag will be released after 5 years of inactivity. Since that started in 2016, the earliest you would see the tags freed
up is 2021.