Skimming through the code (particularly from past issues and PRs) highlights a number of things that look sketchy to me at first glance (in a coding practices way, not in a malicious way) - my gut feeling is that someone smarter than me going through much of this with a fine-toothed-comb would likely find something exploitable.
https://www.atoptool.nl/allnews.php
For anyone interested, here are the latest commits to the GitHub: https://github.com/Atoptool/atop/commits/master/