An enterprise shop I co-op'd at was porting one of their apps from Xamarin to MAUI when I worked there, but certainly it doesn't have much mindshare (if any) amongst SE undergrads at my university.
I don’t think VS Code is remotely a replacement for VS/Rider. I use VS Code for a lot of things but for large and complex project sets the automation and features in VS are luxuries you really miss. It’s like going back to the Stone Age to use VS Code in those contexts. Trying to fill the voids in VS Code with extensions makes VS Code very brittle. VS Code has its lane but I think they are different tools suited to very different jobs.