Beyond what some of the other comments mentioned, Nintendo also took a different approach to their consoles compared to Microsoft and Sony which kind of forces them to lock down their first-party titles.
The Nintendo Switch is very underpowered compared to the other consoles of the same generation (PS4/5, Xbox Series X) but has a huge advantage of being the ultimate handheld / travel console. While Sony and Microsoft consoles can generally push out more FPS or better graphics (usually they lean towards better graphics), the Switch is very limited since it needs to strike a balance of form factor (less space for hardware) and battery life (what's the point of the handheld if you can only game for 30 minutes?).
For a big chunk of their user base, including the folks interested in these type of emulators and using them legally, they would probably prefer to use their other consoles and/or a PC/Mac from a pure performance perspective.
I also suspect that they would get less revenue per copy sold on other platforms compared their own platform, especially with games released by in-house studios.
With the above in mind, releasing a game on other platforms will cut into their revenue stream pretty significantly.
The Nintendo Switch is very underpowered compared to the other consoles of the same generation (PS4/5, Xbox Series X) but has a huge advantage of being the ultimate handheld / travel console. While Sony and Microsoft consoles can generally push out more FPS or better graphics (usually they lean towards better graphics), the Switch is very limited since it needs to strike a balance of form factor (less space for hardware) and battery life (what's the point of the handheld if you can only game for 30 minutes?).
For a big chunk of their user base, including the folks interested in these type of emulators and using them legally, they would probably prefer to use their other consoles and/or a PC/Mac from a pure performance perspective.
I also suspect that they would get less revenue per copy sold on other platforms compared their own platform, especially with games released by in-house studios.
With the above in mind, releasing a game on other platforms will cut into their revenue stream pretty significantly.