I spent some time a few years ago playing some of the multiplayer "strategy" mobile games (FF, GoT, etc). I only ever sunk about $100 into any of them, the fun part for me was the politics and the intrigue on each server and that was roughly the ticket to entry. Got to know some of the whales a little - people who drop $5K-$10K+ on the game without a second thought. No real life names, just some conversations here and there. One was a VC, another a race car driver, lots of people from Kuwait for some reason...
My point is that I'm having trouble applying the "predatory" label when it's high net worth individuals throwing around sums that are ridiculous to me but trivial to them. I probably spend way more on some of my hobbies as a percentage of my income than they do on these games.
Now lower down on the scale, the people spending $100, $200, $500 on these games... that's where I get more uncomfortable.