Nintendo Switch's free-to-play games won't require a Nintendo Online subscription

Yes, this means you can still play Fortnite for free.

Should I buy Nintendo Switch Online + Expansion Pack? - Polygon

Best Free To Play Nintendo Switch Games

With a Nintendo Switch Online membership, you'll get access to online play in compatible games, an ever-growing catalog of classic NES™, Super NES™

Nintendo Switch Online Membership

Nintendo Switch Online + Expansion Pack 12-month Family Membership – [Digital Code] : Everything Else

Nintendo Switch's free-to-play games won't require a Nintendo Online subscription

Daily Deals: Get a Free Year of Switch Online When You Buy Select Switch Games - IGN

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Buy Select Nintendo Games and Get A Free 12-month Nintendo Switch Online Membership - CNET

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You Don't Need A Nintendo Switch Online Subscription To Play Games Like Fortnite - IGN

124 Switch games require paid subscription to play online