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Re:How Discord Handles Two and Half Million Concurrent Voice... by maemilius on Monday September 10, 2018 @06:20PM (#17955681)
Steam has had voice chat (group and 1-on-1) for a much longer period of time than that. I've used it on a regular basis for the last 5 years or so, well before the current updates they've made.

What they added was voice chat to static groups[0], whereas before you had to invite everyone to a custom group chat every time. Definitely a QoL improvement, but not exactly "new".

0: https://steamcommunity.com/search/groups

Re:How Discord Handles Two and Half Million Concurrent Voice... by fro0116 on Tuesday September 11, 2018 @05:00AM (#17958144)
The new chat is a huge improvement over the old one in terms of UX, but lack of persistent history is pretty pathetic considering the amount of resources Valve has available compared to a startup like Discord.