No, piracy is not related to FOSS at all. Piracy in the sense of piracy of proprietary software is arguably detrimental to FOSS since piracy of a particular proprietary software makes people more reliant on that particular proprietary software instead of developing or adopting a FOSS alternative. This is why Microsoft doesn't actually give that much of a shit if home users use pirated copies of Windows or Microsoft Office. In their eyes, you're not using Linux if you're using a pirated copy of Windows, you're not using Libreoffice if you're using a pirated copy of Microsoft Office, and so on.