I know there are some issues with setting the default browser in iOS, but a number of third party apps allow you to set which browser opens web links. For example, I use the Microsoft Outlook app for email, and it gives me the option in its internal settings to open links from Outlook with Safari, Edge or Chrome. Brave is not an option, even though I have it installed. It would be good to get Brave in as many of those places as possible. I don’t know if that requires contact with each developer, or whether with something like Microsoft it’s entirely about what they consider relevant, but if it’s something as simple as making sure Brave shows up as a browser option in the OS, that would be a quick fix.