They don't really need to advertise much for initial sales due to the Nintendo fanbase who will buy the console and games whatever. When they need to create a wider audience for Switch they will need to advertise.
The start of the online subscription service is probably the same time as a big Switch price cut which willl be far enough from the launch that no compensation is required for early adopters. This will also be the start of a major marketing campaign in the run up to Christmas.










