What exactly do you want to sideload on your Nintendo system? Is there a large, frustrated demand for unauthorized Nintendo software?
The game console business model is an historical anomaly. In the beginning, all console games were produced in-house by the console manufacturers. The consoles weren't "platforms" at all. However, 4 Atari programmers got wind that the games they wrote made tens of $millions for Atari while the programmers were paid only a relatively small salary. When Atari management refused to give the programmers a cut, they left and formed Activision. Thus Activision became the original third-party console game development company.
Atari then sued Activision for theft of trade secrets, because the Activision founders were all former Atari programmers. The case was settled, with Atari getting a cut of Activision’s revenue but otherwise allowing Activision to continue developing console games. I suspect this was because the 4 programmers were considered irreplaceable to Atari (albeit too late, after they already quit).
The game console business model is an historical anomaly. In the beginning, all console games were produced in-house by the console manufacturers. The consoles weren't "platforms" at all. However, 4 Atari programmers got wind that the games they wrote made tens of $millions for Atari while the programmers were paid only a relatively small salary. When Atari management refused to give the programmers a cut, they left and formed Activision. Thus Activision became the original third-party console game development company.
Atari then sued Activision for theft of trade secrets, because the Activision founders were all former Atari programmers. The case was settled, with Atari getting a cut of Activision’s revenue but otherwise allowing Activision to continue developing console games. I suspect this was because the 4 programmers were considered irreplaceable to Atari (albeit too late, after they already quit).