Streamers who got subscribers before we introduced Stripe don't need a Stripe account for their old subscribers. These payments are still handled via PayPal. But they are unable to activate subscriptions again without Stripe connection.
From now on, streamers who want to receive subscription payments must connect Picarto.TV to their own registered Stripe account. There is no other way.
Don't worry! Stripe is a good alternative for PayPal and is being used by Shopify, Patreon, Kickstarter and much more. It's safe to use and a trusted brand.