There might be other things at play: https://www.zdnet.com/article/bandwi...y-ddos-attack/

Bandwidth is a (the?) major player in telecommunications today. Many companies, even large ones, get their services from Bandwidth. Ever use Google Voice? You were using Bandwidth. Microsoft Skype / Teams? Bandwidth. I wouldn't be surprised if the cell carriers were offloading some of their traffic to Bandwidth as well.