As far as I know my fiction hasn't been plagiarized, but my nonfic has several times. More than once I've found a blog post or article or section of one of my books on someone's website, used to promote their therapy or wellness clinic or whatever.

Sometimes they even credited me while stealing my work!

A few times I reached out and said 'what the hell' but I never got a response. Eventually I kinda shrugged and moved on. Still irked by it.