If you’re using the custom cloud URL option this only overrides for a specific task (even though you can define it for all the tasks).
Thus, you can duplicate the task with the difference that you don't select the Custom cloud URL, simply tick the the option Send events to cloud.
What is the practical case scenario for this feature?
This way you’ll still have connection to our cloud and if you want to send or update a purpose wirelessly to your device you can.
On the other hand, if you have a custom cloud.jsn file or a customised connector as specified here, you will never have the possibility to remotely change the purpose from your Thingsee One via Thingsee Creator.