Hey etresoft,
Sorry to cause alarm. In the time between posting the report and the snapshots, I did a wipe and clean install to make sure my problems weren't due to a preference or option I had changed.
There was a fault with MacOS where stealth mode was still engaged, even though I had turned the Firewall off (confirmed by System Information -- so perhaps your program was correct and not a mistake.)
As for questioning if there is MDM, I agree it does not show in your report. What do you make of this:
Here's the report after wipe and reinstall:
For some reason the two Ethernet adapters disappeared (en3/en4) and I attribute this to when the Apple Store employee attached their adapter to my USB-C ports (in the first attempt, the employee tried to do DFU restore on the non-DFU restore port, and then had to try again). Just like the Original Poster (OP) WindowServer is running above 10% on idle.
My only point about FileVault and Activation Lock was that when I went into Restore Mode, I was not being prompted to enter any password for my Admin account. Very unusual behaviour. Anyone could access my computer, boot into Restore mode, and then access the Terminal, Disk Utility, and "Reset Password" function.
I don't expect anyone to provide me an education. Like many others here who have worries and concern for their privacy and safety, I am willing and wanting to learn how I can show myself there is nothing to be concerned about.