The question is whether it is only about entertainment or also about real earnings? How does it work exactly?
These games feature unique NFT (non fungible tokens) items, which you own inside and outside the games. It means you can sell these items for real money in different platforms, depending the game you are playing. The items may be acquired during the gameplay (grinding) or at the shop for real money. The point is to collect maximum items as possible and hold until you can sell them for a desired price.
So it's important to choose high demanded games, as there will be more buyers looking for these NFTs.
Quite a complicated explanation. It's very simple, if you want to make real money, you have to choose a game and pump your hero.
For example, the Litebringer game, you create a character and, like in a classic MMORPG, you pump your hero by attacking various monsters and passing dungeons. Accordingly, you will get items and equipment both for sale and for yourself. Selling it for real cryptocurrency.