At least on mobile, Apple and Google are in charge of the supply chain, given their control of the App Store, Play Store, and Chrome Web Store. I would assume t

At least on mobile, Apple and Google are in charge of the supply chain, given their control of the App Store, Play Store, and Chrome Web Store. I would assume that apps with very large user bases go through extended vetting and the company accounts are more locked down than individual developer accounts. For example, I doubt any one person has the credentials to log into App Store Connect and publish a new Facebook binary.