It needs to have some kind of monetization. More like voluntary buy-in. Maybe the web 3.0 could fix some of the money problem here. NFT as skin or avatar, some coin or medal to give others. A portion of the sale could go towards maintenance cost and whatnot

Because you can't have an open api while serving legit user and bot. The bot will eat your future snack of exploiting the data they're amassing. So you end up having some limitation to block the bots to some extend.