They may not have the original source. They lost quite a lot of the original Starcraft Assets and they were only later found by lick in someone's garage or loft

They may not have the original source. They lost quite a lot of the original Starcraft Assets and they were only later found by lick in someone's garage or loft well over a decade later IIRC. I have a lot of code myself (mostly perl scripts, very old .NET and Java code) for old systems that are deployed that weren't in any sort of source control until recently. This may surprise some but until 2006-2007 most source control systems were by today's standard terrible. I've been through the torture of working sometimes with Accurev and Microsoft Sourcesafe and tbh you are better just zipping up your source code and putting a date and time on the archive name. Even more modern systems like Team Foundation Server are painful.