It's just one step worse (maybe two) than everything being a subscription. I prefer buying games(/software) once and being left to enjoy the game.
And in the case of the original Angry Birds, Rovio even removed it from the app stores (and renamed it for past purchases to "Red's First Flight") because of the "game's impact" on their portfolio and business model.
There are some games in there, like the Star Trek one, that are clearly IAP-infested outside of Apple Arcade. You can see the inflection points and the spots where you'd be prompted to "buy" more "transporter power" or whatever. But like watching an American TV show on British TV, where the action fades to black (for a commercial) then comes right back, these are both jarring and interesting. The game would be perfectly playable, and arguably more interesting, without these points but the developers wouldn't be able to hook their whales so they exist elsewhere.
I say “used to” as I gave up browsing the App Store.
App stores are too polluted with garbage now, they went from being a unique selling point of mobile platforms to entirely useless and I think IAPs are largely to blame.
Straight forward, you can play it to see if you like it, you can play the different characters to see if they match your play style. No other purchases needed.
One of the most fun tower defense games I've played in a long, long time