I wish that there was a clearer separation between the end of the chapter and the start of the advert asking for people to join the translation team. It's always extremely jarring because I can't immediately tell when the chapter ends so suddenly seeing an advert breaks my sense of immersion immediately. They should add a large 'End chapter' message at the end of the chapter, before the advertisement begins.
As for the chapter itself, I'm betting our protagonist will contact other plagiarised authors whose stories the plagiarist is still writing and ask them to post their endings too before the thief can, so that the trend makes the public suspicious.