Well the babel Bike was not a big hit, so you may be correct. I posted it here because i liked the concept and thought the bike roll cage might have a broader appeal as an add on for existing bikes.
The sister of a friend of mine had a nasty bike accident in Portland--a fairly bike friendly...
The babel bike roll cage (the 2nd link) was crash tested with an idea of protecting cyclists from collisions with autos/trucks. They also strap the rider in. That was discussed in other links. That bike is not being sold any more.
You may be right that the trike roll cages were not designed...
Here is an example of a roll cage for a tadpole trike
https://mrrecumbenttrikes.com/racingtrikes/trublu-4130/
Here is a version for a bike
https://newatlas.com/babel-bike/36991/
These are not an item that is readily for sale in the United States.
The first link is from an Australian vendor...