Was curious and googled it, Invisalign has some limitations (mentioned in "Not ideal for") like moving teeth vertically and rotating canines or premolars. So even aside from the price tag (which I assume used to be even higher) it wouldn't have worked for me.

Would've loved to do without the wires popping out and stabbing me in the mouth, it wasn't a favorite part of my childhood. So much orthodontia.

Would be great if you're doing it as an adult, I wonder how most kids would do with the "must wear 22 hours a day" part. If I could've taken my braces out I probably would have. OTOH I had a couple other removable mouth appliances and managed with those, so maybe it's just because braces are awful that I wanted to get rid of them.

https://happytoothnc.com/braces-vs-invisalign/