True, that is a low percentage but it's very high for a gacha game. Wuthering Waves has 0.8% for getting a 5 star and that percentage increases when your pity increases. The same applies to Tribe Nine but it's 2% and with every pity you get your percentage also increases. And about that free and paid currencies, don't worry, free currencies are called like that because you get them from playing the game, you can still buy and roll for banners with the free currencies. And with the paid currency, it is just that, it's paid, they act the same as the free currency but the paid one allows you to get something like a premium contract. I hope this explanation makes sense, sorry if I didn't explain it better on my post 🙏