[zxspectrum1982]

I'm afraid you have misread.

They are talking about traffic volume (bytes per minute; usually you'd see megabytes or gigabytes per hour but they are massive so they said per minute).

You are talking about transfer speed (bits per second).

You may have a very fast link (transfer speed = 40 Gbps) but transfer very low traffic (1 byte per hour), thus network is mostly idle.

Or you may have a very slow link (100 Mbps FastEthernet) but transfer a ton of traffic (gigabytes per hour), thus network is very busy (which requires good network architecture, server architecture, etc).

As others said: these requirements seem insane for the size of Parler. Maybe they are looking into massive redundancy, different locations, or even doing something else?