Clarification about Pro License and Premium Workspace

Hi Anonymous 

You are correct, if you share content from a Pro workspace users need a Pro licence to view that content.

If you only have a small number of users (<500) it is probably most cost-efficient to by them each a Pro licence. 
If you have a large number of users who need to see the report you can buy a Premium Capacity licence, this is an organisational licence that allow you to mark workspaces as Premium Capacity (amongst many other benefits), content on a Premium Capacity workspace can be shared with users who have a free Power BI licence. 
Note that Premium Per User licence (PPU) does not allow sharing with free licences.

Finally, if the content is not proprietary you could use "Publish to Web" with a Pro licence. This places the content on a public facing web host, so your users (and anyone else) without a licence can view it. Note that "Publish to Web" needs to be enabled by your Power BI administrator.

see https://docs.microsoft.com/en-us/power-bi/enterprise/service-admin-licensing-organization

Hope this helps

Stuart