From my experience booking.com is the most guest hostile platform I’ve experienced to the point I try to actively avoid it. I travel A LOT and can book anything from 20 - 40 stays per jaunt. Whenever I have encountered a problem on booking it has always been met with ¯\_(ツ)_/¯ tough shit energy.
I remember one specific incident when a hotel had purposefully put me in a noisy room (I saw a sheet on the reception desk labelling it as ‘ruidosas’ which means noisy in Spanish). I took a video of it against the receptionists will and ensured I got the logo of the hotel in as well. When I reported to booking they essentially told me to jog on.
On the contrary, anytime I’ve had an issue with Airbnb they have sided with me and provided a refund/assisted me with finding better accommodation.
This isn’t a ‘you book more with us thing’, either. I have substantially more bookings on booking due to the prevalence in Asia but they literally could not care less