What definition are you using?
In
intelligence,
assets are persons within organizations or countries being spied upon who provide information for an outside spy.
[1][2][3][4] They are sometimes referred to as agents, and in law enforcement parlance, as confidential informants, or "CIs" for short.
There are different categories of assets, including people who:
- Willingly work for a foreign government for ideological reasons such as being against their government, but live in a country that doesn't allow political opposition. They may elect to work with a foreign power to change their own country because there are few other ways available.
- Work for monetary gain. Intelligence services often pay good wages to people in important positions that are willing to betray secrets.
- Have been blackmailed and are forced into their role.
- Do not even know they are being used (so called "useful idiots"). Assets can be loyal to their country, but may still provide a foreign agent with information through failures in information safety, such as using insecure computers or not following proper OPSEC procedures during day-to-day chatting.
https://en.wikipedia.org/wiki/Asset_(intelligence)
Edit: and from Webster's:
asset
noun
as·set | \ ˈa-ˌset also -sət\
Definition of asset
1assets plural
a: the property of a deceased person subject by law to the payment of his or her debts and legacies
b: the entire property of a person, association, corporation, or estate applicable or subject to the payment of debts
2:
ADVANTAGE,
RESOURCEHis wit is his chief asset.
3a: an item of value owned
bassets plural : the items on a balance sheet showing the book value of property owned
4: something useful in an effort to foil or defeat an enemy: such as
a: a piece of military equipment
b:
SPY
https://www.merriam-webster.com/dictionary/asset