Following behind Sony and Microsoft, Nintendo are to begin a paid for Online service this year:

After confusing reports and lots of wondering, Nintendo has finally given a solid release date for when the paid online service for the Nintendo Switch will launch. Come September 2018, the free online will end, and the $20 a year online subscription will be required to play games online. Nothing else was revealed, but more details were promised in the coming months.

via https://gbatemp.net/threads/nintendo...tember.495700/