Because the game doesn’t tie saves to Nintendo Network IDs (those came later with Wii U), you won’t get banned. However, it’s strictly for personal use.
If you want to skip the grinding and immediately jump into the game with all of the classic comic book costumes and ultimate upgrades unlocked, you can download community saves. Head to dedicated databases like the GameFAQs Wii Save Section spider+man+shattered+dimensions+wii+save+data