Blazor is cross-platform, in combo with MAUI.NET
AFAIK it's not supporting Linux as a target platform. Correct me if I'm wrong.
* Android 5.0 (API 21) or higher is required.
* iOS 11 or higher is required
* macOS 10.15 or higher, using Mac Catalyst
* Windows 11 and Windows 10 version 1809 or higher
While Linux isn't supported, that is also not a typically significant market for GUI apps.
https://learn.microsoft.com/en-us/dotnet/maui/supported-plat...
The point of MAUI is to be a successor to Xamarin, for which the primary target are mobile devices, by far the largest market niche.