Not sure if this is common in other parts of the world, but I stumbled across this promo while searching for better internet and thought it was hilarious. Probably the worst asymmetry I’ve ever seen and it also costs like $280/month. https://www.superonline.net/kampanyalar/fiber-kampanyalari/10-gbps-isik-hizinda-fiber-internet-kampanyasi
There’s only 1 major ISP in the country that does symmetric gigabit plans, but they don’t have a ton of infrastructure (not where I live). Most people still barely see double digit upload speeds despite purchasing “fiber” plans with FTTB.
Imagine my pain trying to host a Plex server for friends and family.
Peering cost. You have very low cost to no cost for ingress but have to pay for egress. This way they basically save a lot of money.