I was reading the BlockFi website and noticed they have some pretty good promotions running. For every friend or family member you refer to their site you receive 50.00 and they will receive 20.00.
The referred account must maintain a 500.00 balance until 09/14/20 for both parties to get the bonus. If all requirements are met then both parties will be paid out on 9/15/20.
I haven't had very good luck with my ref links but if you happen to be interested comment below. Lock some btc up for awhile, get a bonus and earn interest. What's not to like?