The mobile games industry was killed by ports and low-effort cash grabs. Seems like nobody makes good games that are specifically designed for mobile anymore, and almost all ports suffer from poor controls and/or just not being as good as the original versions.
Stuff like Pokémon Go and Ingress were very promising. Although I feel like Pokémon Go was too low effort and should have had very fleshed out Pokémon mechanics such as wild encounters, turn based battles, etc.