Content is cheap - AI will drop the costs to zero.

Truth is still expensive. 

This is why blockchains will have an incredible decade. Stake weighted consensus and markets are one of our best tools for determining truth.

Blockchain truth is not content truth tho.

A valid block can contain lies.

husband, father, degentleman, haberdasher 🎩🥂

A blockchain can contain truths of the form "account A signed message M at time T" with cryptographic certainty. That's *some* form of truth, which can be useful ones.

Besides that, @rsa.eth alludes to stakes and markets. Yes, you can lie, but if you stand to lose more than you benefit if you do, or if there is sufficient decentralisation that lies are the minority, you can ideally get quite close to the truth. Think proof of stake, prediction markets, onchain oracles, ... Remains to be seen how to apply to more things.