So ... your argument is that Dropbox's valuation is ridiculous because Amazon could completely destroy AWS and take out Dropbox in the process. Because that is

So ... your argument is that Dropbox's valuation is ridiculous because Amazon could completely destroy AWS and take out Dropbox in the process. Because that is what would happen if they did this. Everyone else who does anything important with AWS would drop whatever they were doing and start migrating off of it immediately. But, yes, I suppose "my supplier could lose their mind and destroy the product I buy from them" is a concern that needs to be evaluated.