Its not about being better, its about privacy and freedom. Without Opensource and Linux that were defended by people that understood the impact and importance of freedom in the past, we wouldn’t be today were we are now.
Look at PC and Smartphones. Compare WhatsApp protocol to SMTP. Heck, imagine TCP/IP would have been invented and supported by microaoft only. Internet wouldn’t exist.
Occams razor applies here too, your theory sounds spot on