On the scale of big hosting operations, 60Gbps outbound is not that much. If you're buying full tables IP transit from major carriers at IX points, I've seen 10GbE for $700-900/mo, and 100GbE circuits for under $7k/month. Of course you wouldn't want to have just one transit, but I'm fairly sure if somebody said to me 'here's $20,000 a month to buy transit', on the west coast, it's within the realm of possible.
Ideally of course they should be able to meet a fairly wide number of downstream eyeball ISPs at the major IX points in the bay area and offload a lot of traffic with settlement-free peering.
60Gbps outbound from AWS, Azure or GCP would be astronomically incredibly expensive.