Why do people keep saying posts are AI?

[hazelnutvanillalatte]

Who is posting AI posts, what's the point? Or are these posters saying they are bot posts? Again what would be the point? I'm seeing this accusation on loads of threads

Apparently Mumsnet is a good site to "scrape" (detest that term - makes me shudder!) for material that makes AI seem even more authentic and human. So, they are practising on us. Whatever that means and for whatever reason.