What?

professional and work emails

I think you meant personal and work.

Since we are doing hypotheticals to the situation, maybe the devs during some messages back and forth used a malicious link so they could access or spoof Elfa's browser, so they could look through and find their personal information, and also look for things like bank account info, social security number, etc, so they can rob his identity or steal from him.

Also another hypothetical is that you are another one of that guys shill accounts, or are affiliated with that app.

But we can do hypotheticals all day, most of which probably won't be true and will be just hyperbole, but the facts are this fucking dev somehow came up with someones information, and harrassed them by calling, texting, and emailing them repeatedly, all because they were butthurt about criticism of their app.