Substack on Thursday announced the launch of its Creator Accelerator Fund, which provides a $20 million funding guarantee aimed at helping creators grow their audience and move their paid subscribers from another subscription-based platform to Substack. The company says the fund is designed to ensure that creators will retain all of their current revenue during their transition to Substack. In contrast to other newsletter platforms like Ghost and Beehiiv, which charge monthly fees, Substack take...