Apple launching TestFlight builds?

For a recently created app, I've noticed in my server logs frequent calls from Testflight builds from IP addresses that seem to belong to Apple. Is this normal behavior for builds that are not in review? (There's no external availability for any of my Testflight builds, in fact most of the builds that are being opened somewhere are expired). Just curious as it's polluting my database quit a bit with multiple launches per day.

Apple launching TestFlight builds?
 
 
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