This article is a pretty good round-up of the issues from the perspective of tabletop games on Kickstarter: https://www.dicebreaker.com/companies/kickstarter/news/kickstarter-blockchain-cr...
Honestly nobody knows exactly what Kickstarter is planning to do with their blockchain implementation. This means the fears cover everything from cryptocurrency implementation (with its associated carbon footprint), to an attempt to dodge regulation (with the idea that the blockchain is 'ungovernable') and NFT implementation (with its obvious grift and ponzi-scheme economics).