I would have assumed Google's pub/sub, which released a similar feature a few weeks ago. https://news.ycombinator.com/item?id=24658132 https://news.ycombinator

I would have assumed Google's pub/sub, which released a similar feature a few weeks ago. https://news.ycombinator.com/item?id=24658132 https://news.ycombinator.com/item?id=24658132 That, or they both had convergent evolution and came to the same set of requirements, maybe from some big user at the same moment contacting both of them a year ago, which actually feels really likely to me (more likely than them responding to anything).