Seems pretty obvious to me — the Switch 1 still has a couple of years left of releases at least, and since the 2 will in all likelihood be backwards compatible, they don't want PCs out there running Switch games at higher resolution/framerates than what the Switch 2 will be able to do. Also, I'm sure the Switch 2 will have an improved encryption/copy protection scheme vs. the original, but if history has shown us anything, it too will be cracked eventually and if the 2 has similar architecture to the Switch, existing emulators may be fairly close to being able to run Switch 2 games which would be even more damaging. It's true that another team(s) will probably take up the mantle, but there are only so many devs with the skills to do this, and most of them have lucrative careers already, so this seems like a pretty effective tactic as much as that sucks.
The State of Emulation topic
Re: The State of Emulation topic

We here shall not rest until we have made a drawing-room of your shaft, and if you do not all finally go down to your doom in patent-leather shoes, then you shall not go at all.