Kiwi.com did seem pretty blatant in what it was doing, but banning the publication of flight information seems both overbroad and prior restraint on free speech. I regularly publish “Southwest flight [and] fare information” on this site. They are even barred from “committing any other acts in violation of Southwests Terms & Conditions.”
The Kiwi.com case is about the power of website terms and conditions, and a company to control information it publishes publicly on the internet.