My guess is that who got purifications was who had bought the points to get the pouches when they changed the code so they were able to buy 1 pouch and bought by mistake purification runes because they continue to click on 'redeem' without figuring the item changed after the 1st pouch because given how easy is to get them there is literally no reason to buy them (is like buying dangod or shape-shifting cards).

So 99% of them (i won't say 100%) just wanted to abuse the bug but had the unluck to be on when they updated the game object number for that slot.

Even so, you and I pointed out that there were better options instead of runes. So far, these people appear to me are the same people that make rookie mistakes like spending all their coupons/ingots in RNG events, using items outside of rebates, thinking a 5* ninja is stronger than a 3* without comparing kits, etc.

I'd say it was worth it since i got a gold purify from these purification runes i got from this event.