Does Jitsy meet consume data from the hosting or only from each user?

Hello good day,

I have to make a web application that at a certain moment can carry out about 200 video conferences of 1 to 1 each.

1- Does Jitsy use bandwidth of the hosting or only the internet connection of each user?
2- In case jitsy uses hosting bandwidth, what type of hosting could be suitable without spending too much money?

This is the code that I would use to make the videoconferences (Each one would have a different name to differentiate them) https://pastebin.com/GNbKza50

Thanks!