Coreflute Real Estate signs is probably a good one, a reuse of material.
Combat video of 'Century 21' taking out Russian assets, might cause concern :-)
With modern brushless motors and lithium batteries power is not so much an issue.
On further thought, I wonder if its NOT really cardboard ? Unless you can see the flutes.
Foamboard is far better strength to weight and formable material.
Not so much the Art stuff you find here, but the stuff used below that has less dead weight.
Speed Deamon: a 100+ mph foamboard plane that you can build!
joshuawfinn
https://www.youtube.com/watch?v=CrthAYulnzI
All sorts of crazy stuff can be made to fly due to power of modern electrics.
https://www.flitetest.com/planes#/listSort=date_high_to_low
Something else on old and new. Even still aerial survey pics have their place.
How Ukrainian drone pilots are changing the course of the war against Russia.
PBS NewsHour
https://www.youtube.com/watch?v=dgrX8w9Adao
Second half of this item, The Old Fogies Drone unit, with old style drone.
Wings, and still pictures on a sdcard.
Old style photo recon, by those at or near pension age.