Specifically, the model should be the Wikimedia Foundation. That is, a non-profit organization with lots of stakeholders and slow procedures to guarantee accountability, and lots of resources to guarantee it won’t go away. This is the pragmatic least-bad solution to the problem of centralization on the internet.
What should they be doing instead? Begging for donations? I do agree in general, tho. Seems they should at least be squirreling away some (or most) of that money into a foundation, because they’re obviously going to need it one day.