It is a common mistake in tech circles for people to believe that they are smarter than the people making decisions like this. Besides the obvious part about protecting their reputation as being easy to work with, there are
always details behind the scenes in decisions like this that make them make more sense. You don’t know their tax position, what relationships/deals that being less friendly here might have endangered, etc.
Investors have given them $2.5 billion for a reason. One of those, undoubtedly, is that they are not stupid. Suffice it to say that they believe that this decision is worth at least $800k to them in the future, or they wouldn’t have done it.
If you are ever in a position to become a LP with General Catalyst, then perhaps you can ask them for their rationale and decide for yourself if they are trustworthy based on all the facts. Until then, making judgments based upon not even close to all the facts is just useless speculation. Your conclusion - that they are just stupid or terrible fiduciaries - is almost definitely wrong. You are no expert, but they are.