Super Smash Byleth Ultimate
From the eShop page here in the UK:
“This game does not support the Save Data Cloud functionality of Nintendo Switch Online. However, the ability to recover Animal Crossing: New Horizons save data from the server in the event of console failure, loss or theft will be available to Nintendo Switch Online members sometime in the future.”
“Animal Crossing: New Horizons does not support the ability to transfer your save file from one Nintendo Switch console to another.”
To me, “console failure”, “loss” and “theft” would all require the save data to be recovered to a new console, so I remain optimistic.