System by which outside parties bid to sponsor individual crawlers, with the final slots opened on the sixth floor.
Among the notifications opening the sixth floor, Carl sees that sponsorship bidding has been initiated on Crawler #4,122, with bidding ending in 45 hours.
The floor's welcome announcement closes by telling crawlers that their final Sponsorship slots are now open to bidding — the last chance for outside backers to attach themselves to a crawler.
The commercial mechanic attaching outside backers to crawlers, in its final round.