Scanners have gotten better recently, meaning they can tell the difference between water and explosives, but these restrictions weren’t pulled out of thin air like many others.
https://en.m.wikipedia.org/wiki/Security_repercussions_due_to_the_2006_transatlantic_aircraft_plot
There was a thwarted terrorist plot to use drink bottles to hold explosives.
I use alldebrid because my use case is slightly weird (I want to keep files in my debrid and stream them from it so I can have a big Jellyfin library without having much storage) and their retention is best.
Torbox is a newer to the market (less will be cached) with a couple of bonus features. My second hand impression of it is that it’s still in Beta (usable, but not free of bugs or stable). They seed the torrents you download.
Debridlink is less popular (less will be cached), but seems well liked. They also seed the torrents you download