At least on iOS, this "freemium" model is actively worse than a paid game for end users -- paid apps and subscriptions can be shared among family members, but in-app purchases cannot.
Do you have multiple user accounts on an iOS device these days?
As far as I know, Android apps can't be shared with other accounts, but all our tablets use my account, so they can all use my apps. Unlike with Steam, where they need their own account and their own purchase in order to play simultaneously.
Not multiple accounts on a single device, but you can group into a "family" that can share purchases, and can play simultaneously.
So my partner and I can each play Civilization VI on our own tablets at the same time, but if I were to purchase one of the add-on packs in the game, that could not be shared (as there is no store-level way to distinguish a consumable sale like a free-to-play game's fictional currency).
You can share purchased apps, games, movies, TV shows, and e-books and audiobooks from Google Play with up to 5 family members using Google Play Family Library.
As far as I know, Android apps can't be shared with other accounts, but all our tablets use my account, so they can all use my apps. Unlike with Steam, where they need their own account and their own purchase in order to play simultaneously.