So along this line, do you not trust any company holding bitcoin? 

For instance, if Amazon were to pull a Microstrategy and own a significant amount, would you not want to own that stock then?

In this way, this is sort of a case for diversification away from bitcoin. 

To be clear, these are hypotheticals and we all agree holding your own corn is the best if possible. 

 Yep definitely wouldn't want to own it in that case. 

If their whole strategy is just stack BTC at a custodian, I think that's actually a bad and risky strategy