Why are trips allowed?
Intelligence gathering . . .
Whitelist.
https:// en.wikipedia.org/wiki/Whitelisting
See Also Walled garden (technology)
Redirected to Closed platform
https:// en.wikipedia.org/wiki/Closed_platform
"More generally, a walled garden can refer to a closed or exclusive set of information services provided for users. Similar to a real walled garden, a user in a walled garden is unable to escape this area unless it is through the designated entry/exit points or the walls are removed.[3]"