I submitted data 5 years ago to a company that Seagate acquired 3 years ago (a different Email address), and my information is available for all to see.
Here's how it works: Once you enter the Email address, click off of the input field and wait for 3 seconds to see if the rest of the fields become populated. If not, the Email address is not in their system. If so, you are presented with the person's data. Furthermore, if data is present, the fields are disabled, so it's not possible to edit/remove it.
Check it out: https://services.seagate.com/online_request_form.aspx — enter firstname.lastname@example.org and you'll see some guy's information from Texas.