There's nothing "noble" about spamming search engines with full text results then putting up a login-wall for the same content you arrived on the page for.
Tricking random users looking for an answer that's supposedly there into registering so they can see the 1 answer is not increasing engagement, just signup counts.
Tricking random users looking for an answer that's supposedly there into registering so they can see the 1 answer is not increasing engagement, just signup counts.