If an app has, say, one million (non-transactional) users, is that interesting? 100k?
One of the hardest things I found with fundraising was calibrating expectations for each stage. My last startup was enterprise, and there were investors who told us we needed one hundred customers to raise a series A and investors who told us two enthusiastic customers were enough. Nowadays, the expectations for enterprise have gotten clearer, but in consumer there's new ambiguity since you hear people say things like "10m users is the new 1m users."