this is very true, and important to remember. i wish more people i converse with online were still on irc, but over the years most have made their way to xmpp/matrix/etc. i have nothing against those technologies since they're open, but irc still holds a lot of nostalgia for me.
another thing i don't hear much about getting used these days anymore is usenet. i used to post in different newsgroups back in the day.
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IIRC Usenet was basically shut down by Google and all the browsers due to the unmoderated nature of it. Google Groups are an archive of Usenet but I don't think anyone actually uses it.