Not suggesting that this flight was anything to do with cost-sharing, but having done some searching on the internet today I came up with 13 websites offering to fly you anywhere. None of them were AOC holders. This is just one example....
https://www.flissair.com/book-online...e8y8gK-qviQLCQ
Add to these all the Facebook pages - I'm absolutely shocked. Must be time for a change in the law..