The difference is that in the PC games you can mostly ignore these and you still have a game you play, where skill and work is challenged and rewarded.
The phone "games" that company develops (again, top in popularity) had no gameplay to speak of. You click a button, something spins, over a large number of spins you reliably lose ingame currency so you need to buy more. You get a lot of smoke and mirrors on top of this - an artistic theme, social media integrations, ranks, titles, events, etc, but again the big difference is that there is no gameplay.