the arxiv is good. treating every preprint you find, even one that is a preprint for an eventually published paper, as having the same rigor as peer-reviewed empirical studies is silly. mostly because there do end up being important and critical errors in arxiv submissions that for various reasons are not ever corrected except for the final journal version. arxiv papers should be relied on for something critically important without verifying. when you can, it’s good to steal and horde the best, finalized version like sci-hub.