I finally got around to rebuilding my pihole. My wife's phone as absolutely rife with requests for various Real-Time Bidding (RTB) domains. It was a flood of them like I really haven't seen before. I didn't do much troubleshoot, but when we looked at her phone, the Facebook app seemed like the likeliest culprit. (Facebook, after all would be the best-placed to have the user data required to actually participate in RTB.)
Once we deleted the app, the RTB requests went away for good. I've had pihole previously, and she's had the Facebook app previously, and we never seemed to have this issue. Perhaps Facebook is drudging up whatever profits it can since it's mostly cornered the population, and is potentially in decline.
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