I think it's because of all the news on micro plastics being linked to increasing the chance of cancers.

I don't think plastic coffee brewers can be a source of micro plastics unless they're ground into dust which is far from their intended use case.

Have you ever had to replace a pan because the non-stick coating had worn out over time? That's wear and tear. It happens regularly with pans and many other plastic objects, and I have no reason to believe that it doesn't happen with coffee makers.

Also, you seem to be under the impression that microplastics contamination can only happen when mechanical wear and tear is present - but it can be caused by heating as well [1] [2]

[1] https://news.ycombinator.com/item?id=37624070

[2] https://news.ycombinator.com/item?id=36440911