>(Is AM commercial radio even still a thing? It was 30 years ago, but only in the sense that there were some stations whose owners seemed to have forgotten to turn them off.)

It is here in the more densely populated parts of the world, where you actually have to pay non-trivial amounts of money for an FM license, but it looks largely not in northern Maine.

Searches show there is still a licensed AM station in Millinocket, WSYY-AM, but judging by its Wikipedia article it definitely seems to fall into the "forgot to turn it off" category.