OK, here is my 2 cents .... Nearly every potential client that asks me to build something in Bravo Studio presents me with an overdesigned Figma design that is suitable for a presentation to a advertiser or client. It is not an app design tool -- it is not an IT technical tool. I have to redesign their apps in my own Figma instance in order to create something that will work with Bravo Studio, remove all the layers of artist design and only has elements that have Bravo Tags, I have often recommended that the client use paper and pencil to draw up a sketch of what they want and put some explanatory text about the flow of the app and what they expect elements to do. Then I walk through it with them and get them to present scenarios of how the user interacts with their app.
What is unfortunate is that Figma and XD are the only front ends to Bravo Studio -- currently. It is too bad that Bravo Studio has a dependency on these tools and no control over what happens to them. I hope XD and Bravo Studio work out a compromise to allow users to have a simplified front end designer that only allows elements that are supported by the Bravo Master Tag list.
As @app.monster says, let's wait and see. Probably some new pricing. I agree that is very likely and I am actually surprised the free Figma tool has been free for so long.
Keeping my fingers crossed for a good outcome for Bravo Studio.
Mary