There is no free support, e.g. call center agents for Windows 10 users. As for security vulnerabilities in Windows 10, Microsoft is going to continue fixing them until at least 2032 (probably longer with extended support) anyways, as Windows 10 1809 LTSC end-of-life is 2029 and Windows 10 21H2 IoT LTSC is supported until 2032.
Microsoft isn't that into you either. With Windows 11 you are not a customer, you and your data are the products.
Servers don't have Desktop GUI, so there is no way you can run a browser on a real server installation. That's done specifically to limit the attack surface. This applies to almost all Windows Server roles except very few such as ADFS which Microsoft is struggling to migrate for decades. Definitely to the root of all security - AD DC.
If you've elected to create a Frankenstein of a domain controller and a desktop/gaming PC and are using it to browse any websites, all consequences are entirely on you.
1. https://learn.microsoft.com/en-us/windows/whats-new/windows-...