Another success story of Pharo: from 2008 to 2015 ATMs (Automated Teller Machine) deployed in Moscow streets were developed and run using Pharo. As the bank is now closed for other reasons it is now possible to talk about used technologies in public.
This reminds that is not unusal that the use of Smalltalk is kept as a secret or stay hidden behind the scenes. The development productivity in Smalltalk is much higher than in other more mainstream languages and with a dynamic and flexible environment once can quickly react to business changes.
This gives a competive advantage and some business dont want to give too much info to their competitors. Smalltalk is often driving mission critical software - business dont want to tell too much about such software.
And for this special example with ATM machines I guess it would not make much sense to tell potential hackers in advance what software the machine runs...