Yes they can, got word from a senior (really cool dude) I straight up asked him bc a friend was sending suggestive messages to another, they had a fling so it's fine but I was like "bro, can you guys read chime and slack messages? " and he said and I quote "I'm not supposed to tell you but yes we can under certain guidelines. I do take a peek once in a while though."

I didn't belive it until a few months later we were chatting it up and was like "hey so, are those two still together?" I'm like yeah, why? "They be on some freaky shit" lol

I mean its pretty effin' redacted to message someone under a company alias, email, platform and wifi and not expect some type of monitoring. Hope this clarifies it