Because companies are trying really hard to hide the "no" button: it's a single click to say "yes to all", but a safari through dialogues to say "no to all"

Same with websites like Youtube who don't understand a plain "no" but offer a fake choice between "yes, harvest all my data" and "ask me again later". That isn't consent, it's coercion.

1. accepting cookies is not the same as opting-in to advertisement

2. because most of the time, any other option is bloody inconvenient

They are choosing the lowest friction option.