Finimize today has over a million subscribers. “We’ve pretty much spent nothing on paid marketing. The very first couple thousand users we got from a popular blog writing about and recommending us. We got featured in Product Hunt and that gave us another couple thousand users. We then started introducing our referral program and that really helped boost our growth even more.”
Newsletter Crew did a similar podcast a few months ago, check it out here if you're interested in more information from the founder.
https://newslettercrew.com/ep37-growing-to-1-million-subscribers-without-spending-any-money-with-maximilian-rofagha-of-finimize/