Ios doesnt support gacha mods so its basically impossible to get mods on ios
it's mainly because of the ios security system. Not because it would charge them. You can download things through safari/chrome on ios for free, but the ios security may block it eventually. Gacha mods don't release in the app store or in the Google play store, only online, and itch doesn't charge for uploading files, so there would be no charge if it was download able online. But again, ios doesn't support gacha mods.