Depending on your perspective. For "next Google", 35k subscribers is nothing. For a search engine, which has been assumed to be free for the whole decade, 35k paying users is a miracle.
My perspective is "tech startup" that reaches the front page of HackerNews on a weekly basis.
There are plenty of billion dollar companies that make users pay for something that has always been free (note taking apps just off the top of my head).
