Have you ever heard of bleach online? Unlimited ninja? League of angels? They are just browser games too but it is much worse than this game in terms of cash investment. As of rn, I'm doing fine with the game not spending a dime on new ninjas and still manage to kill pain teams. Tbh, this game is just like any other p2w game. You pay to get the good stuff before the players. It's expected you'll probably do way better than a f2p. It's honestly how a game like this or any other that has a money scheme like that. I don't see the point of complaining .

This isn't the first game that has this model. People need to realize that's just how most browser games make money.

I can argue that you don't have to. Don't let the fact that these ninjas are p2w steer you from the game itself. The community is whiny but funny. The forum has a lot of discussion with strategy. It's a good game despite its cons. Again these ninjas that people are paying for will eventually be overpowered by new ones. It's another thing called power creep. :)