THIS IS NOT A FREE APP. This is a classic scam to prey on innocent/unknowing children. First of all, these ads that are distributed we're STOLEN from multiple developers of ACTUAL mods (for Minecraft Java, which doesn't even work on iOS, as it requires Java, a desktop application). Second, the "mods" that are behind the paywall? Yeah, it's most likely just viruses, spyware, and malware.
Do. Not. Download.
Also, just a quick message to the developers- Stop it, you script kiddies with no actual experience in IT.