Which is an unreasonable request. In my day job (security professional at a Fortune "small-num" company) I
do have the clout to beat up vendors. If they f*** up then I do get to get details. I currently have around 50 outstanding action items with one vendor. Thursday was shouting at IBM day. However, even my company doesn't really get to shout at the likes of Microsoft, simply because we have no leverage (what we gonna do, turn off 200,000+ desktops?). (personally, yes please...

)
However, me as an individual customer of linode... I have no such leverage. Being a security professional I note that linode have gone above and beyond the minimal requirements needed by law. They have provided a level of detail that explains the attack vector. They have
not provided a "root cause analysis" (who fucked up, and how). And I don't expect one.
I'm dealing with a small company; the risks and consequences of an individual staff member screwing up are that much higher. (I know small technical service companies; I've work for them, run technology for them; my girlfriend used to work for a linode competitor. I know how they can f*** up).
And this is how you should perform your risk analysis; small companies have a risk profile that is pretty consistent. Even it caker said "we've told our staff not to drunk remote into the admin systems using open access points", what have you learned? One potential attack vector might be mitigated, but the rest remain.
Would I like to know how linode was broken into? Sure! I'd love to know! I'd love to know how Global Payments was breached, as well! (They've been less forth-coming than linode have.)
Finally I'll note that linode staff (and caker, personally) monitor or is aware of each and every post made to these forums. That they
haven't responded is telling; either they can't, or they won't. If you don't like it then take your money and leave. In the "can't" case, maybe linode will be able to get some recompense for lost income; if it's a "won't" case then this is a business cost they've chosen to take.
Either way, I don't expect any more information from linode. My risk analysis takes this into account.
Probably the most reasonable and lucid post on this topic...