Can someone be using someone else personal information and benefit from it

marles116 Said:

"Can someone be using someone else personal information and benefit from it: Please answer and report people using someone else personal information"

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Others Using your Personal Info:

Once someone has you credentials, then they can log in to it on their own behalf. So, change the password every-so-often, and maybe use a new eMail address.

Secure your Info:

If concerned for device access, then (A)verify your devices, and (B)secure your account. Open a new eMail address and use that for your Apple ID.

A. Verify your Devices:

Verify that all devices are logged in to your account, by using this link: Check your Apple ID Device List to See where you're Signed in - Apple Support

then...

B. Modify your Credentials:

Having been stollen, someone lily has your credentials. So, by all means, modifying them.

• Modify: your login credentials (Using Both a New eMail and a New Password for each and all sites)
• Associate: a different method of payment to your account
• Enable: Two-Factor Authentication for Apple ID and for all other accounts that have such an applicable option

marles116 wrote:

Please answer and report people using someone else personal information

Making use of information about somebody’s activities, travels and locations, and purchasing activities is pretty much the entire business model for Google, among other organizations.

There are those that commit identity fraud, as well.

Did you have some particular situation or case in mind?

Apple has some documentation that might interest: Personal Safety User Guide - Apple Support