It's a huge and well-established site, principally run by one person - Åsk Wäppling, aka @dabitch. Such is the depth of the archive that it's staggering to comprehend how she gets any sleep, publishing the world's best ads alongside great creative insight.
With popular sites come costs.
And Adland needs money.
If you can, pop over and donate. There's a Paypal link on the homepage.