From the website:
Cookiedatabase.org is a project that started in 2019, and that wants to bring more transparency in the online world of website tracking and collecting personal data.
Almost everybody gets targeted through the use of cookies and other online techniques. Often, the function and the duration they stay active are unknown to websitevisitors.
We want to change this by describing the consequences for data privacy, per service, and per cookie. To do this, we continually research and moderate cookie details and the services that place these cookies.
In the first two weeks since the start of the project, more than 5000 different cookies were added by our users!