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I don't think a single credible source has shown this to be a vulnerability. You're talking about an attack that would cost, what, millions of dollars to run per day?
Dunno if it's all that expensive when there are hundreds of nodes on several individual malicious networks confirmed https://nusenu.medium.com/how-malicious-tor-relays-are-exploiting-users-in-2020-part-i-1097575c0cac
You'd need much more than hundreds of nodes.
The graph tracks exit probability and the article speaks about the matter, especially what you're referencing. Check it out.