Or, and this is the most likely in my opinion, but it is just a guess. The undercover said they had a lot of illegally sourced coins to mix, asked the Mixer adm

Or, and this is the most likely in my opinion, but it is just a guess. The undercover said they had a lot of illegally sourced coins to mix, asked the Mixer admin to help them mix such a large amount and offered them an additional reward in exchange. That said, we should not jump to any conclusions until evidence is presented. The government could be fronting a strong case in the indictment and then it turns out to be much weaker when presented.