hyperscalers are amazing, it's hard to comprehend what's the inflection point financially for them to undergo such a massive investment. Just a matter of time I suppose given all the other things you do at that incredibe scale.

Many of these cable projects are less about saving money on buy vs lease, and more about wanting to have more data transmission capacity between the points on the cable.

It is about expense. It is cheaper to own than to rent if your traffic is great enough. And ownership provides control and better management.