Last few tickets I filed with Coinbase took days/weeks/never to get a response. Others seems to have a similar experience: https://www.reddit.com/r/Bitcoin/comments/735yqe/how_do_you_...

>> However, there are a few actions you should take right now to limit your exposure ...

None of the actions suggested includes the action of keeping cryptocurrency in user's own deterministic wallet to avoid any exposure from Coinbase side.