It's $120/TB for the first 10TB in a month, so you need to be spending >$1200 just on bandwidth every month before you even get the "discounted" rates.
Vercel heavy user here. They have a very misleading pricing. It's "starting at $150", it varies depending on the region. I end up paying $400 / TB as we have a very international website.
Expensive by Hetzner standards but still cheap by cloud standards, egress from Singapore EC2 instances is between $80 and $120 per TB for example.