I figure that it's showing the Metadata for the pages you provide links for. A ton of other messaging platforms provide that ability to show information about t

I figure that it's showing the Metadata for the pages you provide links for. A ton of other messaging platforms provide that ability to show information about the link. Anything could be sending your message unenciphered. A client could get compromised. It could be pulling an IMAP/E-Mail shenanigans of sorts when it sends your Drafts up. It really falls on how much Trust you're willing to give on its claims. I guess if you'd like to find out, you could watch what it sends for a while to make sure WhatsApp isn't doing anything funny.