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FWIW, WhatsApp shouldn't go down because of DNS. At least, it didn't while I was working there. There are (were?) IPs baked into the app packages so that when you're on a network with bad DNS, the app still works. This also protects against authoritative DNS outages.

That said, the haiku readily transforms to BGP:

    It’s not BGP
    There’s no way it’s BGP
    It was BGP

If the sibling comments are accurate and Instagram and FB are also having trouble, then it's most likely shared infra that's problematic. Load balancers, BGP/routing in general, abuse detection, container management, some of the databases (although when I was there, the fb infra databases that WA used seemed pretty individualized and robust --- I don't remember any failures, certainly not coordinated failures)