If you are frustrated with network congestion, you do not need to resort to selfishness. Here are better, legal alternatives:

Because Selfishnet V3 relies on ARP spoofing, it also opens your own PC to security vulnerabilities. Malware on your network can hijack the MITM position. Furthermore, if you run the tool on a public Wi-Fi (e.g., a coffee shop or library), you are effectively performing an illegal wiretapping operation.

Let’s be honest. Running Selfishnet is technically illegal in many jurisdictions (unauthorized network interference). It violates most ISP fair-use policies. It will make your housemates curse their "bad router."

But it also raises an interesting question:
In a world where bufferbloat is real, ISPs oversell bandwidth, and "smart queues" don't exist in cheap routers… is it immoral to reclaim low-latency for your own critical tasks?

V3 forces a conversation. Maybe you run it once, win your match, then turn it off. Maybe you schedule it during "peak hours" only. Or maybe — just maybe — you use it to teach your housemate that 11 PM isn't the right time to upload a 50 GB iCloud backup.

Selfishnet isn’t a virus. It isn’t a DDoS tool. It’s something far more elegant: a smart bandwidth arbitrator. V3 is the latest iteration of a small, potent Linux script (typically using arpspoof and iptables) that sits on your machine and, without raising alarms, ensures that your traffic gets the red carpet while everyone else’s packets wait outside in the rain.

Think of it as traffic law for the 21st century. You become the crossing guard, the cop, and the VIP limo — all at once.