If the game in North America is 1-2-Switch, we riot.
Nintendo of Europe has announced Switch Online trials similar to the one for Captain Toad in Japan, and it's a game that would actually use Switch Online.
From 7 - 13 August, European region (including Australia) Switch Online members will be able to download and play all of Mario Tennis Aces. The trial is on the eShop now for download.
UPDATE: North America will receive the Aces demo as well.
For a limited time, #NintendoSwitchOnline members can experience the full #MarioTennis Aces game on #NintendoSwitch for free from 8/7 at 10am PT – 8/13 at 11:59pm PT!https://t.co/Yuxlbxs2rx pic.twitter.com/2nvEXH8mYN— Nintendo of America (@NintendoAmerica) August 1, 2019