The Security Mentor

Near as I can tell, some of the commentary is alarmist. The IRS will keep your tax records as private as they ever have.

However, a private tax preparer can sell your return to someone who wants it for marketing information.

And if you file electronically you have to use a private preparer.

Options are to mail in your return yourself, or ask your tax preparer not to share your return with anyone else and trust them to do the right thing.

Reference here.