The number of customers is, effectively, infinite though. YouTube continues to be engineered and continues to grow. It could have, realistically, been finished over a decade ago. But they repeated branch out into new markets with new features, and that seems to work from them.

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Nextgrid 4 hours ago | parent [-]

The new features are an order of magnitude less complexity to build than the main feature - hosting video at scale, which is complete and just requires maintenance.

	▲	paganel 4 hours ago \| parent [-]
		> hosting video at scale, I'm going on a limb here and saying that the scale that YouTube was running on back in 2010-2015 is not the same scale as now, and if they had left their whole infrastructure unchanged, a "finished product", so to speak, the site would have been feeling dated and would have eventually been killed off.