This is only for businesses?
If you think about it from their point of view. They want to send these "free" boards out to customers, who are MOST likely to potentially give Maxim, (hopefully), large orders for these products, in the coming future.
If they supplied these things (which obviously cost fair amounts of money to produce and shipment costs), to all hobbyists who want them, for free. It would tend to give them a huge bill, and yet not that much return in the immediate future.
Looking at the information they require on the form, they do seem to want to make fairly sure it is a proper business, they are sending these things to.
"There is no such thing as a free lunch".
EDIT: On the other hand. Some companies realize that, upcoming Electronics students/hobbyists, are going to be the future and current, Electronics workforce and business people. So by giving them free samples of your products, to help them with their studies and/or hobby. They can help promote their make/products.
Sadly in this case (a quick look at the form), this does NOT seem to be the case.
But they MIGHT accept hobbyist/student orders (free). You could give the form a quick try, you never know.