EDIT: Just to clarify, AWS has a lot of IPs, over 100 million [1]. Let’s just speculate that 1/50th might be in an overall pool for customer allocation. Do you really think the majority of 2M IPs would come back blacklisted in some form? I haven’t dug in to this to actually see if this is the case, but it would seem laughable to even begin to think that this might be the case..
I think the wording should be changed. I would agree that all their EC2's and lightsail instances would be in the RBL/RSL's. AWS have an email service specifically for this use case.
They come and go get listed and delisted so you may find your own nodes to be hit and miss. That is for the well behaved RBL's and RSL's. Spamcop, Spamhaus, Uceprotect will expire nodes and networks after a period of no reported spam. There are a few others that will leave things listed for a long time. I am only basing my experience on those three. The less costly a VPS provider, the more often they get listed. Ramnode for example is almost always blocked. If you have long running nodes, it is unlikely you will find them blocked outside of Uceprotect level-2.
