Picture a crowded train station at rush hour. If you wanted to move through it without being noticed, the best place to stand is the middle of the crowd. Nobody looks at you because nothing separates you from anyone else. Now picture that same station putting a small curtained booth off to one side, with a sign saying step in here and nobody can watch you. The booth works exactly as advertised. And the second you walk into it, everybody there learns one thing about you they did not know before. That is a problem I keep running into in digital money, and it has a name. The group of people you could plausibly be mistaken for is called your anonymity set. If a thousand people did the same thing you just did, in the same way, at the same time, your anonymity set is a thousand and you are hard to pick out of it. If eleven people did, your anonymity set is eleven. So the strength of a privacy tool comes from how many people use it alongside you. The math can be flawless and the crowd can still be too small to hide anyone in. That is why optional privacy carries a cost most people never price in. When hiding is a setting you switch on, the majority leave it off, and the handful who switch it on become a list. The tool did its job. The choosing became the signal. I have felt this myself. I have sat there with a privacy feature in front of me and thought, if I turn this on, am I one of ten thousand or one of ten? Now the strongest case against me, and it deserves real room. Privacy that is always on tends to get banned. Exchanges drop it, businesses steer around it, and the whole thing gets pushed to the margins. Optional privacy survives because it is tolerable. A small anonymity set that legally exists can beat a large one that got shut down. That argument has history on its side. What would change my mind: the share of transactions taking the optional private path climbing year after year until it is just the ordinary way people pay. If that happens, the crowd grew on its own and I was worried about nothing. It is measurable and I am watching it. Bitcoin takes the other side of that trade. Every user does the same thing in the same way, so nobody opts into anything and nobody stands out for trying. It is a weaker kind of privacy sitting on a much larger crowd, and I would rather understand that trade than pretend it is not there.