Sorry, I know this comes off as a bit dickish, but I'm interested to know the circumstances that lead to this point of view :)
The other option could be compiling libgit2 to native code/wasm and use it in RN and web, but it will be harder then just import js-only npm.
Very different from "this app has packaged tutorials and tools just start at lesson 1"
React Native opened the door to allow me to build apps and, realistically, I'm not going to spend the time battling through trying to get native git working through React Native. If there's a native developer out there that wants to tackle this problem and wrap it up in a nice JS module then I'd be in your debt!
[1] https://github.com/isomorphic-git/isomorphic-git/issues/698
edit: fix link