The darkest of patterns, now on flaschenpost.de: they made it impossible to use their website without consenting to them giving your personal data and location to a 3rd party for marketing/advertising reasons. You can opt out later, but only after giving up your data in the first place.
(No way to close the overlay, and removing the element from HTML is impractical, as it pops up on every page change while you navigate.)
Even more evil: they added a subheading, which, if you don't read the rest carefully, makes it seem as if they only try to find out if they can serve your address. But I was already logged in when I took that screenshot, so that question is pure BS.
I use Vivaldi, which is based on Chromium with most the shit parts pulled out, and these are some really helpful extensions that help with stuff like this:
The social network of the future: No ads, no corporate surveillance, ethical design, and decentralization! Own your data with Mastodon!