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according to neoxian, the image size won't affect bandwidth since they're uploaded to a server instead of the blockchain directly, although I haven't tested it myself I imagine then if it's true the number of images can still have some impact because of the length of the image URL after uploading, but that being said, I think most of the bandwidth problems have been solved now ^_^

Ok, that great, but the servers, that host image files, are centralized and owned/rented by steem team?