I just recently received a review of my paper, and it came with a pdf-report of which text fragments match a database of previous publications and the internet,

I just recently received a review of my paper, and it came with a pdf-report of which text fragments match a database of previous publications and the internet, made by some software called iThenticate. So clearly the journal now has a policy to automatically run this test for every submitted manuscript. I haven't seen this before, so maybe that is getting more common these years now.