This is about as shady as it gets.
I was so close to completing my card collection for the Infinity Slots Stories Legends season. All that I needed was the Merlin card from the King Arthur Story to complete the Infinity Pass.
Had I complete that pass -- I would have received $12.5 billion coins ($8.4 billion coins costs my status $49.99 as of this writing)!
This outcome is really disappointing considering I let the game run for weeks. Facebook is flooded with people who posted a similar experience.
Their Wildlife season started yesterday and I've managed to collect 134 of the 192 cards in one day. It's going to be interesting to see if I can collect the remaining 58 cards over the next 43 days...