Yes, I think it is weak point in many ways.
- Risk of hack
a. Price dump due to masses of Hive sold
b. Governance impacted by large powerup by hacker - Nature of UpBit speculators
a. They have little or no interest in the actual Hive project, they bring capital to the network but they also will extract that capital quickly with a change of sentiment
b. We have seen that most of the Korean community is not likely to defend the network in a governance attack, and indeed in the last one many of them sided with the attacker.
Point 1 could be mitigated if UpBit used the savings feature - they don't.
Point 2 is unlikely to change without the liquid Hive being stripped from UpBit (which happened temporarily due to HBD being overpriced and the conversion mechanism).