Welcome to the forum- great to have you here!
The key issue here is whether the would be any sensitive or confidential data in the reports you’d be publishing? If yes, then stay far away from the publish to web option (what we use for the Challenges and Showcases), since it is not secure, even if you put the link within a site requiring login. Please see this thread for further discussion of that:
Publish to web vs Embed - #2 by BrianJ
If that’s the case, and other paid licensing options are not feasible, then I think you’re stuck with the option of distributing the PBIX file itself, either via email or a shared network drive or cloud, or sharing it as a pdf or PowerPoint and losing the interactive/dynamic dimension. Here’s a great quick summary of all your options:
I hope this is helpful.
- Brian