Well for an expats, it's really a gamechanger not having to play three card monte selecting the correct card to use for each transaction. You would be surprised how many transactions are (accidentally?) geofenced based on where your card is issued from, and Paypal pretty much solves these.
I'm an Indian with a few US subscriptions and Paypal was indispensable for years. When they set a KYC deadline involving some dude in a video call suddenly asking me to produce my Aadhar (national ID), I then discovered those services work with my debit cards perfectly. BTW autonomous charging of arbitrary amounts is not allowed in India, AFAIK.