Cheap data transfer attracts trouble, however. 10 cents a gigabyte is much cheaper than buying a CD or DVD, but pirates like to pirate 10x or 100x more than they could ever buy so I think it slows people down.
Circa 2000 when Napster and Limewire were big, Cornell University dealt with it by putting a usage cap on undergraduate IPs and charging for data over the cap. There are some kids who will have their parents pay a few $1000 of parking tickets and data transfer a semester on their bursar bill but it sure slowed the others down.
I believe there are some challengers in this group like backblaze, wasabi, oracle cloud etc.
There's certainly a lot of margin in their egress pricing, and that may allow them to operate portions of their service with smaller margins, and maybe that's anti-competitive, but it's not like any of their services are low cost, so I don't think there's really a case that they're dumping and using bandwidth to cover it. Everything is expensive. There's no law against that.
If you have enough egress, and you can't negotiate better pricing (which is an option!), you should probably consider AWS direct connect (or similar) and send your egress out through cheaper transit elsewhere.