So I am really happy for the news of paypal, and I hope that more companies with their credibility continue to join the crypto world, where the current biggest problem is lack of credibility and insecurity
From what I've seen, credibility only lasts as long as the security does. All it takes is one hack and suddenly they don't have credibility anymore.
PayPal look to be operating via the "security through obscurity" method, since they haven't disclosed much about their operation. It's a mixed bag, since it means it should, in theory, be harder to find a weakness to exploit, but at the same time, it means you can't be sure if your funds are really there, because they aren't showing you any information on the blockchain to verify it.