Bah, not a huge surprise given how brutal the travel tech industry is, but they remained my fav travel site - seemed to often find fares that were missing off google flights or other competitors. Loved the U/I too. RIP.
I've had a number of travel startup ideas but all were held back by access to data.
Booking has made money off travel hand over fist this past decade. It's highly competitive, sure, but for a reason since hotels pay massive premiums to these websites to drive sales.
My favorite part was how the results were listed by "agony", defined as a trade-off between price and length of the trip.