As a person that lives in the UK I would find it odd that I couldn’t use any payment method online – We have grown up with bookies on every street and slot machines in every bar and obviously now have a regulated online gambling industry so see advertising everywhere from TV to print so using a payment system we are comfortable with online seems completely normal for me –
As those companies are clean and legal and as gambling online is legal in the UK I see no reason why PP wouldn’t work with them – I noticed on my last trip to Vegas Ebay has a huge slot now so they obviously recognise the money in gaming but need to do it carefully so as not to risk their core business