If you're looking for a simple, polished, developer-friendly alternative, check out Radar (https://radar.io). Think Twilio/Braze/Amplitude/Segment/Radar vs. SNS/Pinpoint/EventBridge/Location Service.
Tim Hortons in Canada is being probed for using Radar Labs in their mobile app.
"Tim Hortons' parent company, Toronto-based Restaurant Brands partners with Radar Labs, a Brooklyn, N.Y.-based company , which provides location-based data analytics, and helps the Tims app to identify when users are near competing fast-food restaurants and coffee shops."
Heh, Burger King did that to offer $0.01 whopper coupons but I guess the difference is the app had to be in use and known to the user to recognize the location--