Info websites based on Quotes

Hey!

Wondering, if websites built content just containing Quotes can be monetized via ads?
Quotes can be related to anything (Movies, famous personalities ..)

I see many websites doing this. But ain't each quote considered a duplicate content?

Any insights on this would be helpful.

Why not. Yes it can be monetized.
I don't think you will get copyright issues with quotes lines as they are not too long.
About duplicates yes it may hurt seo point of view

I can give you live example of my site

First add some unique articles with proper formatting and all, unique design of website is must.

After adsense approval, change the theme according to auto-posting of quotes and all

Done.