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There are expenses involved in creating information. Unless these expenses are met, there is no incentive for many kinds of information.
"It’s called stealing or piracy, as if sharing a wealth of knowledge were the moral equivalent of plundering a ship and murdering its crew. But sharing isn’t immoral — it’s a moral imperative. Only those blinded by greed would refuse to let a friend make a copy…"
Putting a timer before such information becomes free provides an additional incentive to find new information
Free as in free speech, not free as in free beer.
Privacy. People can be quite cruel to those that they do not understand, and quickly attack people based on carelessly shared information.
Information is not a scarce resource.