Free draw isn't any different than pull using a scroll in terms of hitting a jackpot (rare, rune, ninja - you name it). There are those ultra rare cases when hit a jackpot earlier than average (you can compare drawing seals to refining, there's a slight chance tp upgrade with every refine used, however that happens rarely and you are guaranteed to upgrade your gear once you filled 100% of the wish bar- same applies to pulls) during which people pull rare with first x10 or even free draw, this doesnt happen often but from time to time it does. There's no ingame limitations like "you will never pull rare/super rare with free draw", its just another +1 on the counter, all luck.

Unfortunately that's exactly what's going on here if you havent noticed. And wheel based events are even worse than casino.