Nice blog post, but in your list the European Open-Source Snapchat alternative is missing 
From Snapchat to twonly
twonly, a privacy-friendly way to connect with friends through secure, spontaneous image sharing.
(twonly.eu)
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twonly@mastodon.social
@twonly@mastodon.social
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“Paris Marx has offered a guide for how people can get off U.S. tech, highlighting the challenges while supporting individual effort.