And inbound is only because they have installed kiosks that they guide everyone to. Otherwise if you go to a CBP agent they don't take your photo if you're a US passport holder. The kiosks are an end-run around tradition/rules about how CBP can treat Americans.
The big one, as far as I can tell (I've been reading through the prospectus and the latest dell 10q), is that the tracking stock is actually an unsecured interest in Dell (Dell Class V shares). So, you're exposed to Dell going bankrupt: secured creditors would get the vmware stake if Dell can't pay the ~ $1.6 Billion in interest they owe per year.
On iOS you can actually deny access when the OS prompt comes up and WhatsApp will still work. You just have to start conversations using a phone number instead of a name/contact. I use it this way, and it is a little inconvenient but I feel better not uploading my phone book.