I have had it happen to me more than once. Even have had to have some stolen works removed from Amazon.
By and large, I do not care, so long as they are not making money from it. I always gave my writings away for free, and from my earliest days on ASSTR I only asked that they not be placed behind pay walls. I even had some conversations with Ann Douglas about that, and like me she long ago gave up trying to fight the thieves. I am the same, but still go after any that tries to actually make money selling my works.
Advanced Wordsmith