Those numbers did not answer any of your questions.
They are doing significantly better than the main competing travel agent website:
https://www.macrotrends.net/stocks/charts/BKNG/booking-holdi...
https://www.macrotrends.net/stocks/charts/EXPE/expedia/marke...
What I always find interesting is middlemen businesses that don’t do any of the risky and laborious work, such as operating hotels and airlines and car rental businesses, earning higher profit margins and profits than the businesses that have to put much more on the line.
You would think the internet would especially be able to split the profit margin of these middlemen between the customer and the actual businesses that do the work by automating and commodifying the middleman’s function.