I previously had 10Gbps symmetrical fiber[1], and it was simply impossible to saturate without running a speed test against another customer.
Servers were generally not fast enough to make use of that speed. XBOX downloads would sometimes peak near 1Gbps, but not sustain.
The main issue, I suppose, is that disk drives are not fast enough, or at least, not fast enough relative to their size. You can have 500MBps (40Gbps) hard drives, but your cloud provider has 50-100 customers at least accessing that drive, so your share of the straw is fairly small.
More pedestrian uses can't possibly benefit from such bandwidth either. 4k Blu-rays max out at 128Mbps. I suppose we could have 3D 8k120 streams taking 4Gbps (128*4*4*2). Maybe you can just go uncompressed, so 382Gbps (2*7680*4320*120*48), but that seems like it probably causes more trouble than compressing/decompressing, since it will be rather hard to buffer, and small hiccups will lose huge amounts of data.
In short, I think it wouldn't be substantially different than having a good 1Gbps symmetrical internet. It might allow Stadia like experiences to be really good, but those still have latency issues.
You shouldn't actually need that much disk bandwidth to run something like a reddit though. 192 GB of RAM (which gaming motherboards can support) costs under $1k and should be enough to keep several weeks worth of threads warm. On the other hand, a large thread might need to transfer ~100 kB, so at 10k requests/second, that's ~8 Gb/s. I can't find stats on how many page views/second they get, but I imagine it's more than 10k/s and less than 100k/s, so presumably somewhere between 10Gb/s and 80Gb/s you have more than you need for that use case.
I previously had 10Gbps symmetrical fiber[1], and it was simply impossible to saturate without running a speed test against another customer.
Servers were generally not fast enough to make use of that speed. XBOX downloads would sometimes peak near 1Gbps, but not sustain.
The main issue, I suppose, is that disk drives are not fast enough, or at least, not fast enough relative to their size. You can have 500MBps (40Gbps) hard drives, but your cloud provider has 50-100 customers at least accessing that drive, so your share of the straw is fairly small.
More pedestrian uses can't possibly benefit from such bandwidth either. 4k Blu-rays max out at 128Mbps. I suppose we could have 3D 8k120 streams taking 4Gbps (128*4*4*2). Maybe you can just go uncompressed, so 382Gbps (2*7680*4320*120*48), but that seems like it probably causes more trouble than compressing/decompressing, since it will be rather hard to buffer, and small hiccups will lose huge amounts of data.
In short, I think it wouldn't be substantially different than having a good 1Gbps symmetrical internet. It might allow Stadia like experiences to be really good, but those still have latency issues.
[1] https://www.init7.net/en/internet/fiber7/