This is the problem with social media. Anyone with a camera and a computer can make a video saying whatever they want and of course lots of other imbeciles will see it and believe it.
Of course Mamdani's grocery stores will cost taxpayers money. There is no other way to make it work. How anyone can think otherwise is kind of ridiculous really. But this is the mentality of socialists and liberals in general. They do not understand finances and how things work. They also thing that government can alter the laws of economics without consequences, despite numerous real world examples of government price fixing and screwing everything up in the process.