Paying you for podcasts is legitimate when it's connected. You'd be fine if you did something like "support me by getting a lossless FLAC download here" and use Stripe or by providing your Venmo for peer-to-peer money transfer. But Stripe won't work well if you want to take contributions disconnected from service. i.e. there has to be a transaction for them to accept you.

The reason for this is apparent if you flip roles. It's an anti-chargeback mechanism.