GitHub doesn’t own the copilot trademark. I would actually like to have these assistants called “copilots” instead of “coding LLM”. Since these are going to be a part of our lives let’s use a useful and memorable name.
Simply via commercial use, Github could choose to assert a common-law trademark on 'Copilot' within their field-of-use. But also, they've registered "Github Copilot" at the USPTO: