Your cable options have an 80gb limit?! WTF!! Comcast has data caps (which is stupid) but it's 1TB and I think my 7 person household has only passed the halfway mark once, so it's meh. But 80GB?! That's insane! Destiny 2 is an 80GB download itself.
I'm a bit confused about 1. First, you can't private message someone if you're not friends and/or don't share a server. Second, all DMs are placed under the DM menu and are visible until you delete them.