Ideas are non-rival goods
In Economics, there's an useful distinction: rival goods and non-rival goods.
For rival goods, consumption by one individual implies that another individual cannot make equal use of it.
Are examples of rival goods: food, land, and most consumer goods. If Alice purchases a dozen eggs, those same eggs can't go to Bob's house. If Bob sits on seat 3F on the air plane, Alice can't seat at the same spot.
Non-rival goods, on the other hand, are not depleted through consumption.
Prime examples of non-rival goods are: information and art. Other examples, up to a point, are public infrastructure and places.
Alice getting to know today's news doesn't hinder Bob's ability to do the same. Alice's quiet enjoyment of a piece of music doesn't detract from Bob's enjoyment.
Getting to know more and newfound knowledge doesn't detract from anyone's ability to do the same.
Good ideas, especially when put to good use, multiply the experiential and material wealth on the world.
Ideas must be set free.