Published papers are part of the EB-1 visa rubric so huge value in getting your content into these indexes:
"One specific criterion is the ‘authorship of scholarly articles in professional or major trade publications or other major media’. The quality and reputation of the publication outlet (e.g., impact factor of a journal, editorial review process) are important factors in the evaluation”
Is arXiv a major trade publication?
I've never seen arXiv papers counted towards your publications anywhere that the number of your publications are used as a metric. Is USCIS different?