So, everyone here is familiar with the idea of gaining email sign-ups for a yet-to-launch product... effectively, expressions of interest for a thing you want to build - votes that, yes, there will some people out there waiting for the thing you're making.
But how about applying that market-development concept to newsletter mailing lists?
People launching a newsletter may typically begin by generating the content, and then finding an audience.
Has anyone seen any examples of newsletters that begin with a sign-up box but which don't promise any content yet until the thing launches? It could be a way to de-risk the thing, if there is little interest, right?
How would you go about this? No different from launching a product?