http://whirtorrgetftvz4g466sjqkegtyi35bjl4bvotfkfossunf5my4x6ad.onion/blog/one-bitcoin-mixing
To demonstrate our commitment to responsible use, we explicitly prohibit the mixing of funds greater than one Bitcoin. Transactions involving larger sums often raise red flags, so the rationale behind this commitment lies in the understanding that transactions involving significant amounts of Bitcoin are more likely to come from illicit activities.