The asymmetrical internet speeds are intended to keep hobbyists and small businesses from self-hosting, thereby driving traffic to larger companies. I wonder if ISPs get any kind of kickback from large companies like AWS, cloudflare, or digital ocean. Like, reduced hosting costs for their websites and internal cloud services.
Takes tinfoil hat off
The reality is that it's probably a lot cheaper for ISPs to make connections asymmetrical because it effectively lets them pump up their download speed numbers for free. However, ISPs really should give customers the option to custom allocate bandwidth. Instead of saying X upload, Y download, you get X Mbps maximum and can choose the upload/download split.