In fact, there are already several complaints regarding cryptocurrency on PayPal on this forum. And most of them are related like what you have said. This is actually in PayPal's terms and conditions. And indeed if we don't read it first, we will be trapped in it because we can only buy and sell there and cannot withdraw. If you want to withdraw it, you must first convert it to the fiat available there.
At least, this is what in their
PayPal Cryptocurrency Terms and ConditionsYou currently are NOT able to send Crypto Assets to family or friends, use Crypto Assets to pay for goods or services, or withdraw Crypto Assets from your Cryptocurrencies Hub to an external cryptocurrency wallet. If you want to withdraw the value from your Cryptocurrencies Hub you will need to sell your Crypto Assets and withdraw the cash proceeds from their sale.
Yeah, it seems like PayPal uses the moment of BTC to attract many more people using PayPal. It is like a free promotion when very booming issue about PayPal and cryptocurrency several months ago. But in fact, this is not what expected as we are.