Normal RN apps ship with React Native and Hermes embedded (kinda like how Chromium is bundled in Electron apps*).
In this case, React Native is already on the host OS and just gets linked dynamically, so you can ship smaller bundles.
* RN is not Electron and not a webview, but
Our team at @AmazonAppDev will be posting Eric Fahsl’s great talk on Kiro from @reactuniverse_ soon, but for now check out @giolaq’s tutorial (link in reply)