Interesting idea. I wonder how it can be realized.

So far as I see, no CoinJoin happened to exchanges. Most of the exchanges like to use the hot-cold-deposit wallet model. Because it's safe and reliable. The hot and cold wallets have obvious features. The cold wallets have a lot of Bitcoin so they are always shown in the rich list (https://chain.info/richlist). And the cold wallet only has one-to-one transactions with the hot wallet, which has a huge number of transactions.

I manually checked the gathered hot and cold wallets of every exchange. They all look well.

But there is also an exception we found later. Some exchanges like to use a changing addresses as the hot wallet. The hot wallet changes its address every time after it generates a transaction.

The CoinJoin problem is really hard to solve. But as we see, nowadays, there is actually no/few CoinJoin in exchanges, especially big exchanges.
This paper has been peer-reviewed by some experts. They also addressed the issue of CoinJoin. But I cannot find a way to solve this issue.

It's a bug. We'll fix it.
Now you can choose the language manually, on the bottom of the page.

Real Data.

The website changes language according to your browser settings. It doesn't work, does it?

I wonder if there is any suggestion for the algorithm we use.

https://www.techrxiv.org/articles/Dragnet_A_Method_for_Tagging_Bitcoin_Addresses_of_Exchanges/11852739

We are a group of developers and data analysts. This paper is a recent work by our team. We explained how to find out the Bitcoin addresses of exchanges. The final results are shown on this website (https://chain.info/). Hope for suggestions.