I see it absolutely everywhere still. We all exist in our own bubbles.

Yes it's basically every website in Australia you can pay via PayPal now. I use it less and less since Apple Pay is available pretty much everywhere, but it can still be handy now and then.

Popular in South Africa also and remains one of the very few credit card processors where you can bill in USD and remit in ZAR (no Stripe in SA)

I see it all the time in Europe. Many German online shops have Paypal as the default payment method and may even process card payments through Paypal.

Also, it's often the way people transfer money between each other.

Still see it sometimes in the UK, but if it's there often there's an extra fee to use paypal instead of card, so I doubt many people use it.

Card number is standard, with an increasing amount of places supporting Apple Pay (thankfully)

Luckily I haven't for years now. But might indeed be different regions.