How long and how much does it take to develop this kind of a program and a system?

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Masaru Suzuqi -under review-
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Joined: 06/06/2018

I learned of the existence of something called 'local 5G'.
It seems to be quite costly to install and requires a license, but I soon learned that there is a similar local 4G or 3G LTE available.
It seems to have advantages over Wi-Fi in terms of cost and interference. I also saw an article about how you can build your own LTE (4G?) network for less than 1 million yen (around ten thousands dollar).

This Nokia product seems to make it easy to set up a local 3 or 4G network.

I found this product at https://www.nokia.com/networks/products/flexi-zone/#features-and-benefits

Is it a practical solution to build a network in the stadium that takes advantage of this and allow customers to watch HD video reliably on 4G-enabled devices?
Better than trying to build on Wi-Fi?
Why did Levi's Stadium build its own network infrastructure with Wi-Fi instead of LTE, with huge capital investment?

edit:$ to ¥

Masaru Suzuqi -under review-
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Joined: 06/06/2018

In case you're wondering, the stadium's big screen was practical. The stadium has a 400 metre track, but from the farthest seat, the screen looked quite large. To be exact, I had thought they would sell a day ticket of the football match but all the tickets were sold out. I had no choice, I checked out the existing large screen from outside the outer wall of the stadium with two little girls I did not know who, not from the seat.

By the way, they halved the number of spectators. There was no cheering, but the supporters were giving a pretty cool cheer with drums and clapping. It was very better than the Japanese robotic regular cheer, you know. I was only watching for about 10 minutes, but luckily someone scored and I was able to hear a short loud cheer. That was a pretty important game for them.