> Apps should be self-contained in their bundles, and may not read or write data outside the designated container area, nor may they download, install, or execute code which introduces or changes features or functionality of the app, including other apps.
Roblox is in clear violation of this clause, downloading and executing entire games written in Lua. Apple does have an exception to this policy for HTML5 games and streaming games but Roblox does not qualify because it is not HTML5 and not streaming. Many people have had their businesses destroyed for far less serious violations of App Store policy.
I believe there are also other rules against putting an app store inside your App Store app. Clearly Roblox is an app store for games, with its own currency. Apple has not been reasonable on this point with other companies: they originally didn't even want to allow cloud game streaming apps to play multiple games in a single app. Their ridiculous plan was to require a separate Apple App Store listing for each game that a streaming platform supported, and they only relented under pressure after Microsoft went public with their complaints: https://www.theverge.com/2020/9/11/21433071/microsoft-apple-... And after that debacle they explicitly added exceptions to their policies for game streaming apps. They have never done so for Roblox-like apps, which are still plainly forbidden under their publicly posted policies.