[rvnx]

> Isn't the point of providing the data to give bidders a reason to bid (no point in bidding outside their market)?

Yes

> If so, that would give all data to any bidder, as claimed above.

No, the big networks like Google or BidSwitch (which is an aggregator of traffic from other networks), they send you a randomized % of the requests.

The more you buy ("win-rate"), the more this % increase (so the number of requests per second you are allowed to receive.)

Some networks don't care or are too small, so they send you 100% all the time.