I've read the post from TOR https://blog.torproject.org/blog/some-statistics-about-onions
But they don't really answer my question, they mention that there are 30K onions that "anounce" their existance every day, but in their intro they mention
Approximately how many hidden services are there?
But they don't answer it, so I'm curious if there's some kind of way we can estimate how many onions there are.