You're underestimating the number of people willing to pay. Like MC said, once you use money in a game, you can never go back. And once you realize how much you spend in it, you would be unwilling to leave the game.
Now, of course they would still be F2P people. But it would be hard to enter the ranks unless you give it your whole time. Which some can actually do if they become a game streamer or utuber.
But just like Wuteva, once you get a taste of money from the game videos, most likely it'll go back into the game.
Ikrr it's just that this game feels soo money grabbing, like even tho i also like to spend money in game i would feel overwhelmed by the amounts of paywalled contents and stuff. If this were a real game i feel like the reviews would mostly be negatives and there won't be millions of active players lol. Like this game literally made other gacha games feels like a saint...
Well, according to the manhwa, this game's ai feels too real, it's otherworldly (LoL). Each master has their own world and nothing is repeated. Which, if this is irl, that game company must have a computer system the size of a castle. There's no way a game this big can be played in a mobile phone, even with separate servers. So no, I don't think games like this can be THAT successful irl.
This is so real, and it goes so fast. I’m ashamed of myself but the first 0,99€ I put in a game (mind you it was monopoly and dice dream) became 239,49€ a year later, just raking up small and medium purchases (2,99 or 5,99 or 3,99 to a whooping 9,99 occasionally) and the worst is I was not even among the biggest spender. Just like that one other game where purchases started at 12,99 and somehow it was mandatory in my clan to buy the first pack.. we had 200 players and were ranked 9 , imagine the rest…
There will always be people willing to pay, games like that prey on ego and obsession to be on top of it all.

The game is soo p2w bruh... you need real money to do high rank summons, even useful functions like recording gameplay and the replay records need gems which need real money. How come there are 1 mil players??