The most recent ones I've noticed are Riders Republic and Borderlands 2. Helldivers also introduced a bunch of new microtransactions years after it's launch.
You can still play it but increasingly games are becoming very different from what you bought.
I've started noticing a disturbing trend. More and more games that are older being sold at steep discounts or "free to play" and simultaneously jampacked with invasive telemetry and/or ads/microtransactions. And since Steam won't let you play older versions, those games are effectively dead.
Why? Because her Android has Genshin Impact, Fortnite, Roblox, Candy Crush, Wuthering Waves, and Sky: Children of Light.
These games are all great examples of everything I hate about mobile gaming: full of incessant ads for microtransactions. Literally every mobile game I've ever played (outside of FDroid) is this way.
Plus you need a controller anyway, at which point you might as well just carry a handheld ging system.
You could buy whatever your favorite Anbernic device for $50 and have access to a library of thousands of fun ad-free games.
Of it's not tracked then how do they know which ones are in the top?