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Discord might not be officially included, but they still complied.

«Big Tech» is a bad term to use IMHO, but if you do, why wouldn't it cover Discord(/Tencent) or even Telegram ?

Going to say Nope there....I know a lot of kids using discord, they do not have age checks in Australia.

Seems like it was only newly introduced for Australians wanting to access Discord (not-)servers (and/or channels) declaring themselves 18+ only.