No. In fact, Erlang was open-sourced because Ericsson gave up on it. From wikipedia: > In February 1998, Ericsson Radio Systems banned the in-house use of Erla

No. In fact, Erlang was open-sourced because Ericsson gave up on it. From wikipedia: > In February 1998, Ericsson Radio Systems banned the in-house use of Erlang for new products, citing a preference for non-proprietary languages. The ban caused Armstrong and others to make plans to leave Ericsson. In March 1998 Ericsson announced the AXD301 switch, containing over a million lines of Erlang and reported to achieve a high availability of nine "9"s. In December 1998, the implementation of Erlang was open-sourced and most of the Erlang team resigned to form a new company Bluetail AB. Ericsson eventually relaxed the ban and re-hired Armstrong in 2004. I know this seems like a black mark on Erlang. I think it just demonstrates the difficulty of carving a new niche. Training developers in a new language and paradigm is hard.