What's the default value of a data store?

You have to make a value inside of a Player in order to check for player's data. There is no default value.

It atchually tuns out that nil is the default

'nil' is not a value

DataStores don't exist until you create one using a server script. However, there are values that are in a DataStore with default values that are usually 0, "", and 0,0,0. Depending on the datatype.