How do companies make money from subscription boxes?

Sure, here's a questioner's tone description based on the paragraph: "So, how do companies actually generate revenue from these subscription boxes that seem to be all the rage these days? I'm curious about the business model behind them. Do they rely solely on the recurring payments from subscribers, or is there more to it? Are there any additional revenue streams, such as upselling or cross-selling products within the boxes? I'd love to hear more about how companies make money from this innovative business model.