I think the problem I have with what I wrote three years ago is that my emotion around this was way over the top, and as a result my legitimate concerns around the model (and how it could damage honest use cases for sending messages, such as newsletters sent in a one-to-many format, or journalists emailing potential sources), got overshadowed by hyperbole. I could imagine hundreds of people doing this on a single list, overwhelming a single user or organization. I would prefer to see an approach like this managed at the standards level rather than from a startup, because I could too easily see it misused.
I have a lot of complex thoughts around this model, because it’s gatekeepy and unworkable at scale, but this clearly whipped-off post didn’t properly convey them.