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Re:How We Manage a Million Push Notifications an Hour by 9nGQluzmnq3M on Thursday August 29, 2019 @07:16PM (#20834616)
Did you read the post? They're using Firebase messaging, but that only covers a part of their workflow.
Re:How We Manage a Million Push Notifications an Hour by kondro on Thursday August 29, 2019 @07:37PM (#20834730)
They’re only using Firebase for Android delivery (which is mandatory anyway). But it is just as happy to deliver to APNS at $0 as well with near infinite scalability.

The actual delivery component of their messaging system is unnecessary.