Effective today transfers to Coinbase email accounts are no longer possible. However, if you set up Coinbase withdrawals in your account - there is no need to worry. Your funds will accumulate, and you can withdraw them as BTC using a regular blockchain transfer (to Coinbase or any other wallet).
This happens because a new Coinbase restriction was introduced after they went public and has nothing to do with BetterHash. All other mining applications offering Coinbase withdrawals started to be affected almost a year ago.
Be assured that we're already working on a better alternative to present to you soon enough!