Nah of course not, though you are playkng through the same gateway IP address everyone will be assigned their own internal IP which follows that. I play online with my 2 sons quite often and its fine. As one other guy mentioned though you may get NAT errors. If you are using the same devices (i.e. Xbox) and have setup Portforwarding then you should be fine. But if its mainly just for raiding you should be fine anyway. EDIT: One other thing, another person mentioned it testing your bandwidth but Destiny runs at a max of around 700kbps. Thats less than 1mbps so if you have say 10mbps connection then you should be ok. I'm not saying it won't cause issues because Bungie's network model SUCKS but as long as you aren't all watching Netflix 4K movies and torrenting while you play then it should be ok.

Nope there shouldn’t be any issues. I play abroad a lot and also on a boat where we have satellite internet with a changing IP. Always been worried they’d think I was getting a recovery service but they must look at other factors like if your stats or activities are massively different. I also annually have my two brothers come to my house and we play altogether on the same internet and we never have any issues. I would say that 6 people on one connection will be testing for your bandwidth.

I used to play a lot with my bro in the same apartment/network. One of us was always NAT open, the other NAT moderate but we play together. NAT issues would sometimes disable voice chat with us or other people in the fireteam, so I would suggest trying other chat software outside of the game.