Hello,
As mentioned in this discussion, it seems that the well-known pre-print server arXiv is considered predatory.
I like the idea of a built-in list (for well known scams) however:
- it would be nice to be able to tune it the list (add or remove entries)
- I think that arXiv (and other well known pre-print servers) should not be part of the built-in list. People using articles from such sources are aware of the “risks”.