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> I've never seen a bug in their service. Having said that, what they do is simple compared to what other tech giants do

Setting and enforcing boundaries to keep your product apparently simple isn't easy. Frankly, neither is consistently making an apparently simple product keep working; especially when it needs to work on so many devices.

IMHO as a former WhatsApp employee, Facebook has no corporate interest in product simplicity and does not incentivize product keeps working as expected either. People respond to incentives and engineering is incentivized to launch big things, not to keep them working. Personally, I have philosophical issues with the FB way of addressing reliability, but that's a rant for another time.