Do you need to ask? It'd be hilarious and a badge of honour from the hackers pov.
Note - I have a smets2 meter and think it's a good idea.
Yes, I mean hacked.
Always a danger with connected systems. I believe that smart meters have many different controls to stop this happening, including digital signatures for important updates and also break glass recovery mechanisms. Not saying it's impossible, but I'm not losing any sleep over it.