They did that for a while, but Google implemented a policy that what gets shown to the Googlebot has to be the same as what a user would actually see. EE got delisted from Google for violating that policy, and ever since then, they have the answer way at the bottom of the page no matter what.

Why did they do that? To make the site less useful unless you'd paid up. i.e. "to encourage you to pay".

Because Google wouldn't list them unless clicking the link revealed the answer, I believe.