It's flattering to receive an interview request, isn't it? Say from a man claiming to be a well credentialed writer named George LaCroix or David Byron or Sean Killian. He's got a hot project. You can be in it.
Let's say it includes a spiel like this:
The book will be an in depth look into their lives and careers, as well as an insight into their profession as an individual genre, and how much the genre has changed over the course of time. I think you would make a wonderful addition to the book, and would be honored if you would agree to let me send you some interview questions via email. I'd simply send you the questions via email attachment, you'd fill in your answers, send it back via email.
Sounds safe enough, doesn't it? Kind of flattering in a suck-up sort of way.
You get a few short email questions- which you answer at length and give permission for the interviewer to use what you've written so he can make money. Where's the harm? Maybe it will get your name out in public just a little more.
What if the man interviewing you turned out to be the David Boyer- the sleaziest plagiarist in the history of copyright infringement? How would you like your name to be associated with him?
He didn't tell you who he really was when he contacted you (because he's cyberstalked and misunderstood). And sometimes he signs the contract with his pseudonym. Is it a valid contract? Sometime he signs his real name because it's too late for you, the writer- you write most of the content, you make nothing, he owns the interview and your named is smeared with his reputation.
So, really- who's zooming who?
Isn't it important to know who is interviewing you?