Right, then you're tax avoiding, and should be charged with tax avoidance.
In cases where you're not tax avoiding, why does money laundering have to be a separate crime? It comes back to "Money laundering is just a cheat code for prosecutors to get easy points when they can't actually find real wrongdoing."
If you don't tell the government you're moving resulting in taxes not being paid properly then you're damaging the government and by proxy, society. Atleast, that's what I think.