I think it might be the unfounded accusations of this money going to pay for police misconduct.
Considering the history of the city and corruption, I would say this is a fair assumption to make.
I mean, it was right there in the title: Miami Launches 'MiamiCoin' to Make Millions and Fund the Police. I wasn't saying they're doing this specifically for that case, but you know, they probably have a lot of ongoing and future litigation too.
Funding the police seems like it's turned into funding the military, and endless and ever-growing expenditure of what seems like a mayor's private political army.