In the BfA quest “Twist the Knife”, the player stands right in front of N’Zoth, where he speaks to you and infects you with his corruption.
For perspective’s sake, Neltharion, who was like the most powerful non-divine being in existence, got irreversibly corrupted by the Old Gods just by chilling in a cave somewhere, where he could hear faint whispers. But if an average, pathetic human or gnome stands a few metres from N’Zoth’s face and has a little chat with him, then he’s completely fine?
Well then there’s also a follow-up quest “His Eye Upon You”, in which Brother Pike performs a special ritual to cleanse your corruption. If it’s that easy, why wasn’t it ever used on anyone else?
But the best part is that the “ritual” is literally just Brother Pike zapping you for 6 seconds. wat
I was under the impression that Old God corruption is all-consuming and incurable (unless it’s a red dragon cleansing a subject before it’s even born, hence how we got Wrathion not be murderous)