I've noticed that as technology has progressed over the last few decades, it has gotten progressively cheaper - like, it used to cost some serious $$$ to host your own website/community back in the day, but now you can easily get away with it for less than ~$100/yr.
people that like to create things have a vested interest in maintaining their creations - presumably they'd pay some small amount in order to have their creations (or a digitally archived copy) preserved for posterity.
not familiar with DAOs, but it sounds sort of like a form of currency. if everyone adopts it, or recognizes its value (much as American currency is valued in countries with weak economies), and the tokens are redeemable across multiple platforms (or have a real world value), then that, along with other sources of remuneration (crowdfunding, donations, etc) could easily pay for the cost of hosting content long term.