If you own a physical copy of Brawl and a Wii console, you can create your own ISO.
If you prefer ridiculous, broken, overpowered characters, Brawl Minus is your mod. It also requires the NTSC ISO. Smash Bros Brawl Iso Ntsc
A: Nintendo typically goes after distributors (websites hosting links), not individual downloaders or emulation users. Playing Brawl on Dolphin does not connect to Nintendo's servers (since Wi-Fi Connection was shut down in 2014), so you cannot be banned. If you own a physical copy of Brawl