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Hi. Yes there are. Let me clarify how it works because you are paying the pricing somewhere.

There is a licence called Power Bi Embedded in azure. You can pay for that one and it will let you mark a workspace with capacity (like premium). 

The thing about his licence is that it will let you use it to build a custom web app that can get reports, dashboards and more from Power Bi Service. You can build your custom app with custom login that will show a report connecting with a different account than the one in your custom app. That will let you connect to Power Bi service with the Pro Account and show that to users logged in the custom app.

They have build the web portal and are offering it as a solution for customers. The thing is, you will pay for Power Bi Embedd in your tenant or theirs. Because it is ilegal to do it without the licence.

I hope that make sense.

P/D if you are interested in something like this I know some sites and the company I work for is building an app like that too.