Why are some of my most recently spoken-to friends' profiles inaccessible suddenly?

The 2 it happened with so far are both offline, and only after that it did this so I don't think I'm like blocked or something? (Can't imagine there was a reason for that anyway)

I also can't message them. I suspect this is what happens when you get blocked, but is there another explanation since that doesn't add up and these cases are unrelated, yet happened simultaneously?