I have ATT fiber.

1000/1000 for $70/mo, no data cap, includes hbo max.

I upgraded to 1Gbps a while back, mostly because the price was the same. Also though I don’t really need it. Then I realised I can now download AAA steam games in the time it takes to make a cup of tea. No need for a separate storage drive anymore.

I rarely need that much bandwidth, but it's convenient when available. Example: when I do an OS update. The lower latency and reliability of fiber is actually more important. DOCSIS / Cable networks are very flaky, subject to interference. There will be small periods of packet loss that literally come and go with the weather (or perhaps a neighbor messing around with their wiring.)

95% of consumers won't notice, but if I'm in the middle of uploading a docker image and my upstream bandwidth drops from 30 megabits to 3 megabits due to increased packet loss and TCP re-transmissions, I definitely will. I've had this happen before. Massive packet loss in the neighborhood. It took months to get it fixed.

Can't reliably run my personal cloud with just 100 Mbit/s. The best fiber service I had access to was Frontier out in Texas, and my location capped out at 500 / 500, which was great at the time. I could easily run my personal cloud... Plex Media Server, Nextcloud, etc.

Nowadays, with my UltraHD Blu-ray rips on the Plex server, it's not unreasonable at all to require more than a 2 Gbps connection to reliably stream those. I'm often away from home, so it's nice to just be able to log into my own personal server to watch stuff at it's native and highest available quality.

Mostly for my personal cloud... Plex Media Server, Nextcloud, etc., because any service that's offering a $300 connection will also let buy a static IP for a nominal amount.