On building business models on top of open source projects: https://medium.com/@johnmark/open-source-business-models-considered-harmful-2e697256b1e3
(Different things have been tried historically, but businesses need to provide value! FOSS is not necessarily a business opportunity.)
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Linux historically used magic numbers to recognise structs being used incorrectly with void pointers. These have been increasingly replaced with type-safe macros: https://lwn.net/SubscriberLink/915163/ba83480903b82cb8/
Some of the original files were unchanged from the 90s!
https://github.com/m0smith/malabar-mode is a very respectable major mode for Java. Historically Emacs' Java support was weak (lack of interest apparently).
Historically, many accepted scientific theories have been discarded in the face of more data. How much more in tech, which is so young!