Technically the ONLY Exotics you can "earn", though some could argue getting the chance to receive the bounty itself is random, are: Thorn Invective Super Good Advice Bad Juju Pocket infinity Since these are the only Exotic bounties that you must complete to earn. You can also get these from RNG, but completing the bounty is actual earning. EVERYTHING else is random and you get lucky. If saying you "earned" through random drops, is like going to Vegas putting a dollar in the slot machine and hitting the jackpot on this first pull. Did you earn that jackpot or was it just random luck?