I heard from a reliable person that if snow isn’t shoveled it becomes a Bor b’reshus harabim (ditch in a public thoroughfare)
This then becomes an obligation on every individual because the halacha is everybody has an obligation to remove a bor.
So start shoveling.
FYI ask your posek but you might be able charge the homeowner for the cost of removal of the snow, even though the homeowner didn’t put the snow there.