Even if they don't allow direct purchases with crypto, just by setting it up as a virtual e-coin people will tend to get more familiar with it.
This way there will always be those among them that will wonder if they could actually do more with it, looking it up and ending up to PayPal's competitors that allow them to do so.. this can also boost BTC power, even through the wrong means (PayPal)..
Even Revolut that recently added BTC as an exchange option but does not directly allow people to purchase using them, made more people get interested in it, just by doing trades with it, benefiting by its flunctuations.
Ever since that update, a bunch of people have got to ask me if there are ways to get control of their own BTC, just because they tried exchanging it through Revolut.