This is an absolutely HUGE vote of confidence in Hive by one individual (?)... I should probably develop this thought in a post.
In order for this individual's investment to be secure, the core operations of Hive need to keep running and even growing.
HBD is backed only by Hive. If Hive goes to 0 or the chain stops, HBD is worthless. This is the counterparty risk of HBD: there's pretty much always a counterpart risk to anything. For USD it's the continued existance of the United States of America. For Gold it's the existance of a market for Gold (beyond utility). For HBD it is the entire continued ongoing existance of Hive AND the token price.
To put $1m against that is a bit vote by someone (unless he/she/they/them is/are worth billions and then it's just loose change :-)
RE: @lazy-panda now with more than 1M HBD in Savings