The likelihood of an angel stealing your idea is pretty low. If an angel really gets enamored with your idea, s/he most likely will try to persuade you to work with him.
The possibility is very slim that an angel already has or can build a technical/business team quickly with expertise in same domain to execute on your idea. The red flag for such situations is typically when someone tries to string you along for a while and keep trying to get more and more details from you.
Before you engage with any angel, make sure you know what you want from him/her, final outcome for such conversations, and how long do you want to engage with him before moving on.
The possibility is very slim that an angel already has or can build a technical/business team quickly with expertise in same domain to execute on your idea. The red flag for such situations is typically when someone tries to string you along for a while and keep trying to get more and more details from you.
Before you engage with any angel, make sure you know what you want from him/her, final outcome for such conversations, and how long do you want to engage with him before moving on.