either because they think they have a bigger potential audience if Node is used, or because Node is what they know best.
10 Things I Regret About Node.js - Ryan Dahl https://www.youtube.com/watch?v=M3BM9TB-8yA
We have already seen this abused in browser extensions being repurposed to inject advertising, in node and ruby modules being converted to malware, cryptocurrency miners being added to games on Steam etc. There was even a Nintendo Switch game that bundled a Ruby IDE, I believe iOS has had apps surreptitiously bundling other software too.