This depends on multiple factors. Entities like YouTube which use a lot of bandwidth own boxes in datacenters (well in Google's case, they own the datacenter as well). From there it depends on the DC. Most IP transit is charged based on the max of your egress or ingress costs. Some DCs offer you unmetered bandwidth but then charge you more than you would have paid for transit.
The big cloud companies, like AWS, GCP, Linode, or Hetzner usually have these deals in place already and then charge you for egress to recoup/profit off their bandwidth costs. At $200 / yr, you're going to be playing big cloud egress costs as most IP transit is a lot more expensive. Cloudflare [1] has a series of posts about this though the costs are probably very out of date by now.
[1]: https://blog.cloudflare.com/the-relative-cost-of-bandwidth-a...
