They announced in 2016 they had TPUs. So no, I would not expect that 2 full years later they're just now being available in the public cloud. These are not new products to them; they likely just don't want to deal with supporting them in different configurations.
Exactly my point. It's a lot of work. That's the reason why Nvidia has such a large team doing it, and also why they spent 3 billion dollars to build the V100 ASIC.
