PayPal is strict and just joined the bandwagon. With the first days of their adoption, they don't have a withdraw option and this option was just allowed later on. If you've got some funds in there, withdraw the fiat and deposit it on the exchanges like Binance or any other popular exchanges that's easier to access.
It's a shame cause this would be one of the easiest and cheapest ways to buy crypto, if only it worked. Alas, Paypal is a comically bad company.
I haven't checked their rates but they're not a crypto exchange so it's better to just go out there and do the trades on the typical crypto exchange that also have the p2p option where you usually see cheaper rates. PayPal is more of a fiat wallet.