When my kid was younger he had a "garbage games on tablet" phase as well. As others have said, paid games are the way to go (Play Pass sounds cool). Looking for indie games for Android, or PC games ported to Android gives some good results. Stardew Valley’s an obvious one. I haven’t played Ordia, but it looks gorgeous.

What worked really well for us was to teach him about some dark patterns in simple terms and spot them with him in the freemiums he was playing. "Fear of Missing Out" events/notifications and "Progression Paywalls" are typical ones. It made him realize the game wasn’t built to give him a good time as much as to frustrate him into endlessly spending real money in exchange for some phony currency. In the end he was happy to switch to saner games. It’s a good opportunity to work on their critical judgment basically.