Coinbase could easily avoid, or be unable to, provide BCH balances to their bitcoin holding customers.<p>There's no telling how Coinbase operates internally. You can't just assume that 1 customer == 1 permanent bitcoin address in Coinbase's backend. Perhaps they shift funds around all the time into new addresses, without keeping references/keys to the old ones. In that case, BCH balances would be lost, with no way to restore them to the 'owner' at the time of the fork.<p>Luckily (for would-be BCH holders) that seems to not be the case, but I think Coinbase deserves credit for going the extra mile when they could justifiably say that it is not their problem to deal with.