> Dark Patterns are tricks used in websites and apps that make you do things that you didn't mean to, like buying or signing up for something.
And here is the one used by the verge [0]:
> A dark pattern is a user interface carefully crafted to trick users into doing things they might not otherwise do, such as buying insurance with their purchase or signing up for recurring bills
Here there's no trickery and no chance that a user would unintentionally agree to cookies when they didn't mean to. It's just a little annoying thing that bugs you until you do what they want. It's not unethical, but if you don't like it you shouldn't use their site.
[0]: https://www.theverge.com/2013/8/29/4640308/dark-patterns-ins...