They likely have multiple streams for data ingestion including Swarm/Foursquare and the signal data provided by thousands of developers that use their API including some large folks like Uber, Apple, Snap, Samsung, Twitter, Microsoft etc.
Even if both of their apps fail, they likely have a lot more inbound data from these large partner sources to continue to build out a pretty healthy pipeline to provide better data.
Even if both of their apps fail, they likely have a lot more inbound data from these large partner sources to continue to build out a pretty healthy pipeline to provide better data.