My world, along with that of a zillion other geeks, came crashing down around me about 24 hours ago when Amazon Web Services went down and took Reddit down along with it. Things are slowly returning back to normal, but at the moment only paid Reddit Gold members are being allowed to log in. I've actually been meaning to sign up for Gold for a while just on general principle because I like Reddit and want to see it continue to thrive, so this seemed like as good a time as any. Unfortunately, it turns out that to sign up you have to log in. Catch-22.
So... if you're doing an on-line startup, you should build it in such a way that the revenue path stays up no matter what, or at least is absolutely the last thing to go. You never know when or why people might want to give you money. You should never make it impossible for them to do so.