http://whirtorrgetftvz4g466sjqkegtyi35bjl4bvotfkfossunf5my4x6ad.onion/blog/bitcoin-tumbling
The only thing that changed was the connection to the user’s personal identity. However, if the users decided to use centralised tumbler, this might not even be true. In fact, many believe that centralised tumblers, which are not open-source, can become a single point of failure in the future when it comes to Bitcoin privacy, as many suspect that Bitcoin tumbling platforms keep the transaction data.