Hey,
All data that gets downloaded from Intune is free, there are no requirements for an Azure subscription.
Only limitation to know about is on Win32 apps where each app can't exceed 8 GB in total package size. but you can have how many apps you like.
https://learn.microsoft.com/en-us/mem/intune/apps/apps-add#cloud-storage-space
If you want to store data outside of Intune and create your own blog storage then you would need a Azure subscription but most organizations don't do that in my experience unless there's a specific need for it.
Hope this clear things up and accept the answer if you found this useful. Thanks