It is.
Even mozilla firefox is banned on the premise that it can run arbitrary code and yes, that is the official apple instance.
The fact that they apply it when they see fit and allow other times, and that it is totally arbitrary and opaque based on their own private interests, is exactly what everyone with common sense tried to explain when criticizing the walled garden.
That's a huge caveat though.
How far does that restriction extend? Can I share or import Pythonista projects from other people?
What's the difference between interpreting a file I downloaded from the Internet and visiting a website?
If you want to split hair, where would you draw the line? Should pythonista go out of the way to prevent copy paste from the browser/email?
Or should apple, being non-arbitrary, also blocks adobe PDF reader since it can open PDFs from the web with javascript just like a browser would do?
- iSH: an Alpine Linux shell environment, powered by an x86 to ARM JIT emulator
- Scriptable: an iOS automation tool using Javascript, it can even integrate with native iOS APIs like photos and calendars, create native UIs, etc.
- Pythonista: a Python IDE, you can create 2D games, use it as a REPL, integrate with native APIs, and much more
And of course, there are the 1st party apps, Playgrounds and Shortcuts.