Gosh, Stack Overflow thinks our little open-source project is a threat to them. I'm flattered! Also saddened.
For several years, Stack Exchange has allowed some of its sites to control some (local) ads. Communities can nominate ads that they think will be of interest to their own members, and if enough community members agree, those ads run. Mi Yodeya has ads to promote Sefaria, its own publications, and some other resources. Science sites have ads for professional and research organizations and publications. Several sites have ads that promote other related SE sites. Stack Overflow has ads for open-source projects looking for contributors.
The general philosophy is (or was) that the people building a site are the right ones to decide what to promote on that site -- they know their audience better than the company does. (Which, if you've seen some of the other ads the company runs across the network, is self-evident.1)
This week the company announced a change in qualifications for these community ads: Read more…