It's pretty common knowledge that a lot of the games on the app store are P2W bullshit. Is there any games that can still be played regularly without having to drop money, such as Puzzles and Dragons, Summoners War and even Teeny Titans?
Teeny Titans is premium And to answer your Q, here are some games that can be played totally free but abuses the gacha system or a heavy-grind-basis for its collection system: Phoenix 2 (This one is fantastic) Thumb Drift (Another fantastic game)