Tools like Adium and Pidgin let you talk to all of those services using a single tool, so you wouldn't have to juggle a half-dozen clients and keep track of which one you used to talk to whom.
For a while there, it looked like we were going to be free of the need for this kind of tool - a time when even companies like Google and Facebook embraced a common messaging standard that let users talk to one another across their walled gardens.
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But the lure of locking in users trumped the user benefits of cross-platform communications, and today we live in a shattered messaging hellscape that includes Slack, Discord, WhatsApp, iMessage, Signal, FB Messenger, Teams, Instagram, TikTok, Hangouts, Twitter DMs and Skype.
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