[kbenson]

Not to mention the video someone posted beloew from an engineer talking about Erlang there in 2014 has some interesting numbers. Christmas/New years is peak, and on Christmas Eve they were maxing out at 146GB/s out.

If we assume they maybe averages 75% of that over 6 hours, that's 146Gb/s * (60606)s / 8bytes/byte * 0.75 * 0.05dolars/GB = $14,782.50 for a 6 hour period (estimate).

That's highest listed bandwidth tier price for Azure, I'm sure they would pay less for a number of reasons. But let's just say that $10k for a whole day may not be out of the realm of possibility. That puts bandwidth costs possibly North of $3 million a year. Even at $1 million, that's a lot of money.

[MichaelGG]

Ok but a serious company wouldn't pay per byte if they were trying to save money. They could buy that much connectivity for like 50k a month. (Though they'd need to get some switches and have a network engineer.)

And if that's audio/video Vs just text, clever NAT hole punching techniques could reduce it if truly needed.

But, it seems WhatsApp was on SoftLayer? In that case their costs might have been vastly higher.