From that date you can cancel for no charge until 11:59 pm local time the day before check-in. Currently, you can usually cancel for free until 6:00 pm on the day of arrival.
Marriott did not publicly announce their policy change. In contrast, Hilton informed the travel community through an announcement on FlyerTalk, claiming they make the change “so that we can provide you with a more consistent booking process and make more rooms available for when you need...
If you are looking for a hotel room you may very well see announcements like "Last chance! Only 1 room left!" or "Only 1 room available for €x". You do not need to take this kind of communications seriously, certainly not at Booking.com.
A complainant submits to the Dutch Advertising Code Commission that Booking.com on its website often creates the illusion that the supply of rooms in specific hotels or at a specific rate is (very) scarce. They also