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I am currently reading a paper BGPStream: A Software Framework for Live and Historical BGP Data Analysis where authors say:

Normally, a BGP session with a collector is configured as a customer-provider relationship, i.e., as if the VP was offering transit service to the collector

In a later part, authors desscribe popular projects offering route collectors:

(...) currently operate 18 and 13 collectors respectively, which in total peer with approximately 380 and 600 VPs distributed worldwide

I am not sure I understand it. VPs and collectors are peering, but they establish a customer-provider BGP session ?

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Each vantage point treats the collector as if it is a BGP speaking customer, so the vantage point provides the collector with a full routing table. That way, the collector receives a full view of how the VP sees the internet.

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