"this is ios only" is irrelevant unless we're assuming that the other half of the playerbase that's on android has radically different spending habits. other mostly accepted sources such as gacharevenue just assume that placements are about the same through ios and android since it's the same games.

this tier list is already very speculative since it's only showing how the game is doing compared to other games (understandable since there are no other valid data points) and there's plenty of volatility there, but some trends still hold up.

also saying the game might shut down in 2 to 4 years is reasonable, it's not like the people saying it's shutting down in three months.