London-based Butter, a “buy now, pay later” financing service, raises £15.8M and says it has over 100,000 customers (Dan Taylor/Tech.eu)

Substack raises $65M Series B led by Andreessen Horowitz  —  When we started Substack to build an alternative media economy that unlocks the full potential of the internet and gives more power to writers and readers, we didn’t know if the model would work.  A lot of people told us that no one would pay for newsletters.