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I installed Malwarebytes (somewhat recommended by this article) to do a one time scan on my Mac. It required me to install a service that would run always as a superuser, and would not uninstall completely.

I wrote to them, and got no response. Why is that needed for a on-demand scanner? Why should I trust malwarebytes?

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Choosing the Uninstall option found under Malwarebytes for Mac Help menu effectively removed the service for me.

By “effectively removed” do you mean literally and completely removed? I work in consulting and “effectively” gets used as a weasel word for “not really but you’ll never know the difference”.

I recall looking into the details and feeling satisfied that the launch agent / daemon / helper was completely removed. But I did not perform a systematic examination of all file system state associated with the install.

My point was to advise readers that there is an Uninstall option; just dragging the app to the trash is not enough.

If OP has comments about specific droppings being left around, maybe in /private/var or wherever, would like to learn about it.

For those unfamiliar with the recesses of macOS, there's a venerable tool called Etrecheck that is helpful for sussing out Mac config affecting security and performance.

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