Earlier quoted context omitted.
It would be nice if investment in Tumblr is made to create a privacy focused social network for those who have or would like to remove FB from our worlds.
it's probably not economically feasible to have a privacy-respecting app that's also funded by a programmatic targeted advertising network. even if it was, people have shown over and over that they prioritize convenience over privacy, and businesses simply aren't conscientious enough to try a different way.
People are extremely creative in how they use it, basically turning sites into stores or kickstarter-like campaigns with that little feature. We are looking into extending this functionality.