The niche coffee scene in the US uses them, they are excellent for pour overs, French press, etc. But they are not widely popular since dedicated coffee machines are most commonly used.
My kettle is glass and stainless, and everyone I noticed was either glass or stainless. Plastic is only on. The outside: lid and base, and you’re not drinking out of those
My pour over funnel is silicone. Like plastic but different. Assuming it’s food grade, less likely to be harmful
I think it’s fair to say that kettles and funnels can be found in non-plastic materials. And I have to admit I’ve never seen an”coffee maker” that wasn’t plastic. I suppose a restaurant grade Bunn machine has a stainless steel basket and a glass carafe, but there isn’t anything for the home. Unless someone is about to tell me I’m wrong, which, this being Reddit, someone probably is.