Oh dear. People Playground from mestiez / Studio Minus recently had a major problem with malware pretending to be a mod in the Steam Workshop.

I would say this is a reminder to be careful on what you're downloading - but these types of things are quite difficult for normal users to spot until it's too late. For many it was too late, since this wiped away various things. On Windows at least, it's not clear if it affected Linux (with the game run via Proton).