[carl_dr]

In this case, the assets are licensed under a non-permissive license, so even if the code was a non-issue, that's the problem.

[flohofwoe]

It's probably legal for the 'shareware episode' assets (same for the Doom shareware version), although I guess it's better to let a lawyer dissect the license just to be sure:

https://www.quakeworld.nu/wiki/Quake_Shareware_License

[LexGray]

This seems like a good use of AI. Get some random good enough textures to bundle. Give me a lake of pixelated radioactive acid.

[anthk]

Or just use a free as in freedom Quake data, such as Blasphemer.

[imhoguy]

Assets could be possibly downloaded from 3rd party site on user consent.

[yreg]

An app that doesn't work until you use it to pirate something? Yeah that wouldn't fly in App review.

[fetzu]

I understand the intricacies of it in terms of the App Store, but I don’t think grabbing Quake’s shareware assets qualifies as pirating.

[Cthulhu_]

Yeah but 'user consent' don't make using assets legal.