If the link was still blocked it would guarantee that Facebook is still eavesdropping.

Other guy was right. Think about this easy scenario

  If (E2E_ENABLED) {

  SkipCrawler();  

  SkipContentChecks();  

}

Again, it isn't to prove the encryption works, it is only a test that could prove that it doesn't work.

Ah, yea, I got the argument backwards. I thought he was saying if content wasn’t blocked that it proved encryption worked. Can’t prove the negative.

Yes, totally understood. I am just thinking in line with a different response that this could be an easy way to prove if they’re still snooping - not a guarantee that they aren’t.

Agreed. There is nothing stopping the sender's app from parsing and reporting URLs in any and all content before e2e occurs... Even to FB servers