What and where is the Gatekeeper app or service? The answer is that it’s a collaborative system or technology to check apps and ensure that only trusted software is run.
translocation
There’s more to the quarantine flag, as it’s not binary on/off, and app translocation can trap even notarized applications if you don’t move them right.
You unarchive a freshly downloaded app and try to give it a test run. It immediately crashes. Here’s one common reason, and how to solve it very simply.
App translocation was introduced to stop malicious software exploiting relative file paths. So how come every time an iOS/iPadOS app is run, it’s translocated?
App translocation, signature checks, XProtect and more explained, with key messages from the log to help you diagnose problems.
Using Little Snitch, this becomes unresolvable, as the app can’t complete first run checks, and every time you try, it’s translocated to a different folder, causing Little Snitch to block it again.
The Eclectic Light Company 