Huge companies, yes. They'd still prefer to spend less money/resource/time if they have the option to though, hence why some large companies actively explore cross platform technology. Adobe did that with phonegap a long time ago.
You're talking about Electron there, which like phonegap is a browser wrapper and a different thing to RN. I don't believe RN is known to be a battery drain in general.
Re:React Native for Windows and Mac
by scarface74 on Tuesday May 12, 2020 @11:02PM
(#23162994)
How well did PhoneGap work out?
What are some well done cross platform apps that don't unnecessarily drain battery life? I can think of one - VSCode.