This is game theory playing out. 

If company entities want to hold large amounts of cryptocurrency, which they have to publicly disclose, then they are going to become massive targets because just a few people will be holding the keys.

If you hold 5% of all Bitcoin, the bounty for someone to successfully breach you is 5% of the network - that’s going to be massively appealing.

This is not TradFi where you can call up the Bank or Government and get them to rollback transactions; once those funds move once that’s it, game over.

The world isn’t ready for this but it’s definitely happening. Only question here is if it’s really North Korea or a 3-letter agency doing this and using NK as a figleaf.