Nothing to do with Microsoft. You mentioned websites, so that would be a Browser issue.
It seems that you don't really understand how you use your PC, as I don't see any of the things of which you write. If Notifications are bothering you, switch them off. https://support.microsoft.com/en-us/windows/change-notification-and-quick-settings-in-windows-ddcbbcd4-0a02-f6e4-fe14-6766d850f294
Also, you can use https://wpd.app to disable annoying Telemetry easily.