After years of research, finally we were able to release an initial version of Orbot iOS:

Load it here: https://apps.apple.com/us/app/orbot/id1609461599

And find the source here: https://github.com/guardianproject/orbot-ios

There were 2 main obstacles which were finally removed:

• We found a really good packet routing / reassembly solution: Leaf https://github.com/eycorsican/leaf/
• Apple finally increased the maximum usable memory in Network Extensions from 15 MB to 50 MB

Yay!