If you have a 2018 or later LEAF all of the telematics features are available for a 3 month trial, after that most the features are still free free as well as the connectivity services. There is an FAQ on the EV connect App that describes this a bit further.
The following car telematics are subscription based after the trial:
Horn and Light on
These telematic services continue to be complimentary:
Lock and Unlock
Remote charging initiation
Remote climate control initiation
Plan your Route
Reports and Activity
The cellular connect services are complimentary as well.
An unpublished feature is that Nissan is currently using the SiriusXM telematic OTA SW updates to the Radio as a test. I don't know the full extent of the OTA updates, but I have seen that Apple CarPlay has been updated on my car. Toyota GM Honda and FCA use SiriusXM as well, and do OTA updates for their head units OTA with SiriusXM. The service does have the ability to do System updates, and FCA and GM are testing System updates. I do not believe that vehicle system SW updates are being pushed for Nissan yet.
Here is an interesting story on telematic vehicle technology