One developer who experienced an account breach, Benoît Freslon, revealed on Twitter that malware had pilfered his browser access tokens. This allowed the attackers temporary access to his Steam account, which he used to host his game, NanoWar: Cells VS Virus.
In light of these security breaches, Valve is taking a proactive stance to enhance the safety of its platform and protect both gamers and developers from cybercriminal activities.