It’s much worse than that.
“In practice, ticket brokers connect their proxies—either bought from a third party or rolled by themselves—to other bespoke ticketing-buying software that helps them actually manage tons of Ticketmaster accounts and tons of phone numbers at once. There are a host of ticket broker-specific internet browsers that allow brokers to open hundreds or thousands of browser tabs, which each have a browsing session tied to either a specific SIM card or to an IP proxy which can also be bought from third-party services. This allows brokers to power through Ticketmaster’s “Virtual Waiting Rooms” because a broker can have hundreds or thousands of independent browser sessions waiting as separate “people.” The SIM box (or a SIM proxy service) can then be set up in these bespoke browsers to automatically forward and submit Ticketmaster’s SMS two-factor authentication, which is supposedly designed to prevent scalpers from getting tickets.”
https://www.404media.co/the-sim-farm-hardware-seized-by-the-secret-service-is-also-popular-with-ticket-scalpers/