I think they divested Paypal some years ago. Ah, here we are: https://www.marketingscoop.com/small-business/does-ebay-own-paypal/
Which is why Paypal is no longer the default payment option - payments are direct through Ebay.
Like @PaulWarning, I've waited for 80% off weekends to sell stuff, so it's nice not to have to do that any more. And for a while Ebay owned Gumtree so they've managed to cope with a free listing site in the past. However, this might explain why, when I bought a motorcycle TPMS earlier today, the order completed page that comes up after making the payment had a "You might like to buy this too" advert for a battery charger.