PixelFed - PixelFed is a federated image sharing platform, powered by the ActivityPub protocol.
Flickr - image and video hosting website
Gab - Gab is an ad-free social network dedicated to free speech.
Imgur - Imgur is a free and simple image hosting service with image editing feature. Signup is optional.
Friendica - Decentralisation - Privacy - Interoperability
Google Photos - All your photos are backed up safely, organized and labeled automatically, so you can find them fast, and share them how you like.