Strange, similar services running on my PC: are they viruses?

I've just found this page as I have the same duplicate services as you have above, but with different suffixes. I found this detailed guide which explains the reason for them, and how to stop them being created, since they can't be stopped using Services.msc.

https://docs.microsoft.com/en-us/windows/application-management/per-user-services-in-windows

Windows 10 1709 introduced 'per-user' services for better resource management. These per-user services are created when a user signs in, and then deleted when the user signs out.

In the HKLM\SYSTEM\CurrentControlSet\Services section of the registry you will see 3 entries for each of these services; the regular named service and the the per-user service entries you see in Services.msc. So for instance, you may have Capture Service, Capture Service_xxxxxx and Capture Service_yyyy, where x and y are alphanumeric characters.

For the above example, if you look under the entries for the Capture Service you'll find a Reg DWORD 'UserServiceFlags' with a value of 3. You can prevent per-user services from being created by setting this value to 0. There's more information in the above link explaining how to stop these services.

I guess I figured out the answer.

At the day the question was posted when I shut down the services, I also noticed the W10 functionality activated with Windows Key + Tab wasn't working anymore. The next day when I restarted my PC that tool was working again and after stopping the running services mentioned in my edit of the question, they stop working. Finally after running MSCONFIG as suggested by user '@Moab', I concluded that such services are indeed non-malicious and are a normal part of Windows 10 with at least some of them related to the new timeline functionality that came up with the last W10 update. It would seem, then, that the whole problem is nothing but some downgrade in service naming quality by Microsoft.