Comment by bobthecowboy

Because a shocking number of services don't actually require you to verify you control the email address. I'm talking about mainstream services like Spotify.

I'm in a similar situation, except in my case, the person providing the wrong email address never controlled it - it's firstnamelastname@gmail.com, which I signed up for when gmail was still invite only.

If I go to sign up for a service that someone else has signed up for with my email, I just do a password reset, and take control of the account. Either by transferring it to another email address that doesn't exist and then creating a new account, or if that doesn't work I just nuke the data.