The banner is malicious compliance to exhaust and trick people into giving the same tracking privileges the companies previously assumed they had. Sites are welcome to not have the obtrusive cookie banner if they behave themselves with only relevant cookies.
Malicious compliance is the perfect way to describe websites' behavior. Sites have many ways to deal with regulations, but they choose: Punish the user with terrible UX, while crying 'look at what they made me do!'
These banners are on plenty of smaller sites. Seems the law is unclear, so they have to cover their butts. Doesn't help that many top search results for "do I need a cookie popup" say an unqualified "yes."
Corporate nightmare.