picc.io is described as 'Image file sharing service. Share images as a link'. There are more than 100 alternatives to picc.io for a variety of platforms, including Online / Web-based, Windows, iPhone, Mac and Android. The best alternative is Pixelfed, which is both free and Open Source. Other great apps like picc.io are Imgur (Freemium), Flickr (Freemium), 500px (Freemium) and PostImage.org (Freemium).
Pixelfed is an image sharing platform with focus on Privacy, Safety and Security, an ethical alternative to centralized platforms like Instagram. Federated, Ad-Free, No algorithms, No 3rd party analytics or tracking. Can run on your own server.
500px lets you create stunning professional photo portfolios, find friends, express yourself and connect with likeminded people. It was co-founded by Oleg Gutsol and Evgeny Tchebotarev on Halloween 2009 and 15 million users as of September 2018.