This is the most common "working" crack. The uploader repackages the real ProtonVPN installer with a custom patch. When you run the patch to "activate" the VPN, you are actually installing a rootkit.
The logic seems sound: “If I use a cracked VPN, my ISP can’t see me, so the software police won’t find me, right?” protonvpn kuyhaa
Once Defender is off, a RAT (Remote Access Trojan) slides right in. On Kuyhaa, user comments like "Works great!" are often posted by bots or the original uploader using alt accounts. By the time a real user posts "My bank account was drained," the thread has already been downloaded 50,000 times. The Official Free Tier: The Elephant in the Room Here is the most interesting twist that Kuyhaa users ignore: ProtonVPN already has a completely free, unlimited tier. This is the most common "working" crack