I would recommend IPFS pics - https://ipfs.pics - IPFS is a permanent decentralized file hosting protocol in the same spirit of Steemit and decentralized cryptocurrencies (more info: http://ipfs.io ). IPFS cannot censor/modify/delete your image - the image is permanently stored on the web. The URL you get for image you upload corresponds to a cryptographic checksum of the image file, so it's cryptographically verifiable that the image you uploaded is also shown to the viewers of your post. Normal image hosting services could censor, delete or modify your image, or just go offline or out of business. With IPFS this just cannot happen. :) It is as exiciting as SteemIt :D