One, it doesnt damage your reputation as much as one would think.

But two, and more importantly, no one is checking.

Tree falls in the forest, no one hears, yadi-yada.

Here's a work from last year which was plagiarized. The rare thing about this work is it was submitted to ICLR, which opened reviews for both rejected and accepted works.

You'll notice you can click on author names and you'll get links to their various scholar pages but notably DBLP, which makes it easy to see how frequently authors publish with other specific authors.

Some of those authors have very high citation counts... in the thousands, with 3 having over 5k each (one with over 18k).

https://openreview.net/forum?id=cIKQp84vqN

<< no one is checking.

I think this is the big part of it. There is no incentive to do it even when the study can be reproduced.