Evidence suggests microplastics in water pose ‘minimal health risk’ (bbc.com)
https://news.ycombinator.com/item?id=20766496
"The WHO says the evidence suggests that all larger plastic particles, and most of the smaller ones, simply pass through the body without being absorbed at all"
So while the plastic might not be absorbed, can we say the same thing about what’s stuck to the plastic?
Science involves measuring things. So far, all that's been measured (unreliably) is that these things exist.