Please don't bore us with this kind of politics issue here like with tinted glasses. the technology should be neutral.

JS porting: https://github.com/dchest/tweetnacl-js

Java porting: https://github.com/InstantWebP2P/tweetnacl-java

How to evaluate the required computing resource for training dedicated model(DNN/CNN/RNN,etc) and dataset ?

good idea. especially for start up, hire a team is very very important.

Easy communication and understand each other

need rooted ?

Yep, you'd have to be jailbroken / rooted to use Cydia.

Sorry, I must have been out of the loop. When was the jailbreak for iOS 13 published? (I'm also a complete stranger to jailbreaking—never done it before.)

Sometime in December, but Checkra1n is still in beta and only works up to the iPhone X since the bug was patched on the newer 2019 iPhones.

https://canijailbreak.com/

There is an exploit that can be used, but it only works on old devices (iPhone X and older).

A bootrom exploit has been found that works on all pre-2019 iOS devices.

穿越时空来的 诗人。有趣。

interesting