That can only happen if people fall for it. I consider "taint" an attack on Bitcoin. Governments can't stop it any other way, but "they" can make (some) people believe Bitcoin is dirty.

I haven't seen any definition coming from a government. I've only seen companies trying to sell the notion of taint. They won't tell you what they base it on, and it's all arbitrary and different for each of them, but they need you to believe you need to pay them to tell you whether your Bitcoins are good or bad.