Welcome to Microsoft Q&A!
I've tested this on my side. From the snapshot of the memory usage, I could clearly see the Windows Class is not reducing after the GC and even after a long time when using the x:Bind. But when setting the click event normally, the snapshot shows the Windows Class that was created will be released. This might be an issue for Windows App SDK. Please submit an issue on Github for this: https://github.com/microsoft/microsoft-ui-xaml/issues
If the answer is the right solution, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.