Audiobook niche to small

Hello ladies and gentlemen of blackhatworld. I would love your opinions on the audiobook niche.

So i'm thinking of starting a website in 3 niches.
Adult tube
Movie Website
Audiobook Website

Now the thing is I know adult websites are extremely competitive so i'm kind of ruling that one out.
And I noticed movie websites are becoming stupid competitive as well.


So finally It came down to audiobooks.
The issue i'm having is... it seems very niche.

I used similarweb.com to check the statistics of some movie websites such as 123movies, primewire, putlocker, solarmovies, all of them have over 50million visitors per month.

I then looked at the top audiobook website which I beleive is audible. It gets 20 million visitors per month.
It seems pretty small. Especially considering the fact that they have 180,000 books.

What do you guys think?

My idea was to create a free audiobook streaming website similar to soundcloud but for audiobooks. The niche seems tiny AF to be honest.

This is my own opinion, movie niche will be encounter copyright issue and it's most competitive for a brand new niche site, audiobook can be a good choice for long-term but how you can deal with the copyright, is it better to rewrite the content and make the unique audio? the first option for al** tube is not very tough due to this special niche seduces so much lol, a content content ( many interesting quality videos) can keep the visitor come back all days, i know many friend start from zero and earn upto 3 thousand of unique visitors daily just within 2 month. Good luck with your choice and sharing your success!

audiobook is hard IMO can't compete with old sites