Download Switch games for free on the internet?

So a friend and I have considered, since there are so for nintendo ds and wii on the Internet pages where you can download games s.PC and then (in ds on a r4 card) game card, then formatted and this Games then on nintendo or the wii can play, the question is now, what cards would you have to buy at the Nintendo switch, and there are also pages if so, what's their name? Can anyone help us? 😅

In a nutshell, there are (still) none.

A pity, but thanks, but you can somehow eg. Old ds games play on it when you just download this and pulls on a larte in the switch goes?