The costs for announcing the customer's IPs and making sure that only they are the ones actually sitting on them would be minuscule. Nowhere near $10k/mo. Maybe

The costs for announcing the customer's IPs and making sure that only they are the ones actually sitting on them would be minuscule. Nowhere near $10k/mo. Maybe $100/mo. Anycast/unicast changes nothing here. Anycast simply means that the same prefix is announced in multiple different PoPs.