Piracy: ꜱᴀɪʟ ᴛʜᴇ ʜɪɢʜ ꜱᴇᴀꜱ

Unless you inspect every line of code and/or monitor your computer activity to a super human level then you'll never know.

Viruses don't behave like a neanderthal like they used to 20 years ago, so just because you don't notice a virus doesn't mean you don't have one. Let's be honest, viruses are still a thing and botnets have become a thing. These don't magically appear from nothing.

You shouldn't be blindly trusting anyone on the internet, especially those not abiding by the laws. People and entities can be impersonated. They can behave differently at any moment.

Personally i would do one of three things, run pirated content, in a VM, on a separate drive, or on a dedicated computer - because why take the risk when you don't have to.