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Head of the Signal app threatens to withdraw from Europe
(www.bluewin.ch)
This is a most excellent place for technology news and articles.
It was intended as an ICQ replacement, and its advocates even managed to sell it as that for many normies. It became supported, with federation or not, by many email service providers, social networks, and so on. Then that support mostly vanished. Its users percentages are not inspiring.
I think you mean IRC replacement.
Both. In my surroundings QIP was popular, a Jabber client with an ICQ gateway added from the start or something like that (maybe it just was a client of both). And the whole "roster with buddies and IM windows" thing was definitely more ICQ than IRC inspired.