While no definitive "smoking gun" was universally agreed upon, the suspicion caused many prominent community members to label it "malware" or "rat" (Remote Access Trojan), leading to a decline in trust. Performance and Modern Status
"I personally liked the UI, but the performance was just terrible compared to something like LiquidBounce or Rise." [1.1] Sigma 5.0 Hacked Client
The client featured a highly searchable GUI, making it easier for users to find and toggle specific modules among the hundreds available. The Monero Miner Controversy While no definitive "smoking gun" was universally agreed
Even without the mining allegations, Sigma was notoriously resource-heavy. Users on lower-end PCs often experienced significant FPS drops due to the complexity of the custom UI. Sigma 5.0 Hacked Client