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2000: your conversation medium is a standard protocol with a native client on every platform
2010: your conversation medium is a website
2015: your conversation medium is a web app
2017: your conversation medium is an app only available on Android and iOS
startup idea: RPG Maker, but for chat applications
What if the galactic singularity in xkcd's "Team Chat" (https://xkcd.com/1782/) is running on Amazon Lambda?