Seconded on sampling bias. It's a bit difficult to get a directly comparable figure from the FCC's Measuring Broadband America report, which tries to be representative. https://www.fcc.gov/reports-research/reports/measuring-broad...

I guess the closest would be "In September-October 2019, the weighted average advertised download speed was 146.1 Mbps among the measured ISPs, which represents a 100% increase from 2017 and a 8% increase compared to the average in September-October 2018 which was 135.7 Mbps."