Unlike other simple takedowns and throws, Kani Basami targets one knee by throwing the whole body weight on it, which can cause the ACL to blow easily. The ankle is also exposed to the same risk.
In my gym, there have been at least 3 cases of ACL injuries because of uncareful use of the flying scissor.
As an instructor, I don’t like limiting my students’ knowledge, so I try not to ban any moves for advanced students. But one thing you should be certain about, this is not a technique for beginners.
So if you are training in a gym where dangerous techniques such as Kani Basami are allowed, make sure to be extremely careful and gentle with your sparring partner.
Don’t ever use it on your sparring partner without telling them what you are going to do so they can adjust their knee and prepare it to support your weight.