A console being different is not a financial risk when you spend no money on developing it and no money on producing it.
There was no path to bankruptcy, or even meaningful financial loss, if the Wii failed.
The market they actually get isn't the point. It's that they never invest enough money for it to be possible for them to lose meaningful money if their gimmick doesn't work. If Sony doesn't sell PS5s, they're diverse enough that it probably won't bankrupt them, but it will hurt bad. Nintendo isn't even willing to invest enough that not selling is a mild inconvenience. They just refuse to invest.
Compared to any other non-Nintendo platform ever made? No, it didn't. They used cheap junk tech, exactly like the Switch, and didn't commit to any meaningful investment in number of units.
The fact that they use hardware not capable of playing modern games is why third parties have very limited involvement with them. It's why they got ports of 15 year old games instead of most developers of new games even considering putting their games on there. And their bad hardware is a direct result of their unwillingness to invest like everyone else does. Even Valve, who has very limited hardware production, invested far more in the Steam Deck than Nintendo did on the switch.