I don't follow. The game is free, "V-bucks" you buy, I think you just get character/weapon skins that aren't required. I don't love the setup, but since kids are hanging out on fortnite having it free lets everyone who wants into that world.
It's similar to how slot machines require tokens, but I don't think that's quite gambling. The gambling part comes in with loot boxes, where you're essentially paying to roll the dice to get something of value.
Some casinos still have an aisle or two of coin machines for nostalgia though. People collect these tokens, but I'm sure that hobby is on the way out since new mint is pretty rare.