Are they exclusive owner/builders of any of those? I know I've seen a number of cables which Google was a part investor/owner in, but sole ownership would be amazing.
On the other hand, if anyone could use up an entire cable, it would be Google, and there are no particular financial reasons to try to diversity - they are big enough to self-insure any cable losses.
and each dedicated fiber can run multiple "colors" of light, so multiple customers can have their own segment of the traffic fully isolated from each other.
