Unless you truly can pay cash, it's hard to hide the money flow.

Plus, you may want a system which does not reveal the data when you truly die naturally. In that case, you might be able to disable it as you see yourself getting old, but it's better if other humans verify things. You would want to add emailing the press or other interested parties, but that's not hard.

However, another problem is the web hosting company has the real data, and you don't want anybody to have it until you release it. That's why you need a divided key. You could have several web hosts and divide the key up among them, and have them send it on d-day to the host that has the encrypted data.

However, there is a lot to be said for plans that use existing infrastructure. However, with most of those plans, you can't demonstrate that you really did hide the data in a place it will get revealed, which is your best insurance policy. Ideally you want them to be sure you really did it, but not able to get at it, and for the holders not to be able to read it.