In case you missed it, Nintendo added actual physical rewards to My Nintendo.
They require Platinum Points, which are a finite resource; earned by activities like playing various Nintendo mobile titles and mucking about on the Nintendo website.
One of the more recent additions involves finding secret Pikmin to promote the Switch release of Pikmin 3. Here’s how to complete all five missions and net 100 points.
Source: Destructoid Here’s how to get free My Nintendo Platinum Points with the Pikmin 3 quests