Is Paul Graham and Robert Morris's Arc language[a] being used for anything in production other than Y Combinator websites?

[a] http://arclanguage.org/

There still seems to be interest in the project. The forum gets new topics posted every few days [1] and Anarki, a community ran fork of Arc, shows recent commits [2].

[1] http://arclanguage.org/forum

[2] https://github.com/arclanguage/anarki