Again, anecdotally, mine's gone from 1 Mbps upload to 30 in the last ~10 years or so. I don't have fiber, I've got Spectrum over the cable lines, in a small market with not much competition. (It's either Spectrum, or the local phone company's shitty DSL offering. There's one local fiber company, but only in a couple percent of households... including literally my neighbor, but not me.)
I can easily tell which of one of my family has fiber internet versus not fiber internet just by the consistency and quality of our FaceTime calls. Even between the US and England, the fiber to fiber connections are far more high quality and stable than cable and other types.
The ISPs can claim whatever numbers they want, but the real test is what it feels like when you use it.
Specific data on upload speeds is harder to come by, but https://www.tomsguide.com/us/internet-speed-what-you-need,ne... says "According to Ookla, the average U.S. broadband download speed is 96 Mbps and average upload speeds are now at 33Mbps."