1) How do you know the subject matter is one of those covered by the arXiv? 2) How do you know the student has posting rights? Those require endorsement by an a

1) How do you know the subject matter is one of those covered by the arXiv? 2) How do you know the student has posting rights? Those require endorsement by an authorized poster, which would be most likely to contact the PI if asked. 3) Even if posted to the arXiv, a paper can be removed by the moderators. 4) What do you think would happen to the student if he posted the paper to the arXiv without the PI's consent? Conclusion: yours is one of the worst comments I've ever seen posted at HN.