Before thinking this is a free trade, consider that it costs money to short a stock. In order to short the stock, you need to first borrow it from someone so that you could sell it to someone else. When borrowing a stock, you have to pay an interest rate for the shares which were loaned to you.
Some stocks are cheap to short while others could have high double digit interest rates. The rate depends on the willingness of people to lend and volatility.
1) Barry Silbert's BIT has beat the Winklevoss' (or Winklevii) bitcoin fund to market by using a backdoor listing technique.
2) Finra granted its request for a permanent ticker symbol, GBTC, and that “is expected to be effective shortly.”
3) Each share of BIT is worth approximately one-tenth of a bitcoin. As of Friday, the trust’s net asset value stood at $24.43 per share.