Surprised this or malicious games and updates hasn't happened sooner.
The FBI were seeking victims for ~8 "games" earlier this year: https://forms.fbi.gov/victims/Steam_Malware/view
All our network traffic was unencrypted, which enabled all kinds of shenanigans until the security culture seeped into corporations and the public.
When stories talk about time travelers that hijack old technology instantly, it makes complete sense. Someone with modern hardware, software, and knowledge could completely break most technology back then. They better not forget their modem, though.