I’d say yes VPN, even if piracy were legal I don’t need my peers knowing my IP. For slsk port forwarding is more important than it is for torrenting as well, so I’d reccomend one that lets you do that, like AirVPN (who I will also soon be switching to, Mullvad the one I have now recently removed port forwarding, I’m just too poor to switch yet) or protonvpn.