Let's say you win 10$ from the spins, so you need 400$ wager, which of course is not much. If you want to wager it on originals though it only counts 0.20$ for every 1$, meaning you have to wager 2000$ in originals to clear your 10$. With house edge and so on this is a losing business for the player, unless he gets very lucky.
SO basically it's like every other free spin bonus that regularly appears in the bonus section, and I cancel every single one of them.
Yes, at first glance, when you see any bonus or free spins in your personal account, it seems attractive. But as soon as you read all the terms and conditions, you immediately lose the desire to take bonuses. In particular, I personally always avoid bonuses that have excessive wagering requirements.