I pay for 5 podcasts, I do it via Patreon, Memberful, and a custom (stripe-based) solution. I'm not really sure what problem needs to be solved in this space. I pay for 2 podcasts that I haven't listened to in months, I do it because I pay to support these creators. I don't need/want my listen history to directly correlate to sending money to hosts I like (nor do they, they'd much rather have the constant stream instead of peaks and valleys). Also, I actually hate the idea of "boosts", it just encourages bad behavior (just like IAP's that aren't one-time/DLC/remove-ads).