Of course they don't do it at the scale old telecos are doing it, doesn't mean they are completely new to this kind of thing. Doesn't really take a genius to do this anymore. AWS directly invests in third party companies to lay out intercontinental dark fiber for them, wouldn't take them much to do it themselves if they want to do it on the scale of a teleco, it just isn't a good financial decision to do so at the moment, not a lack of technical expertise.
You are just deflecting the main point of the argument now. Companies like Jio have already proven that all you need is to throw money at this problem and it can be solved. You just need to make sure that the money you invested can be earned back.
With all due respect I sincerely doubt you have ever had the equivalent of "enable" or "configure" access on the core routers of any significant ISP. Not anything in the top 1500 worldwide by CAIDA ASrank size and customer AS, peer AS measurement scale.
Using jio as an example of "why don't the faangs just build their own massive ISPs at OSI layer 1 by throwing money at it" is so dreadfully wrong and misinformed I won't even dignify it with a further response.
