That's scary. I use PayPal to pay for steam games just out of convenience.
My account is almost 20 years old (I signed up because you had to in order to play HL2) and I've purchased a lot of games over the years.
I have to use PayPal to buy games on Steam, simply because my bank account (Revolut) is from a different country to where I live (both in EU). It's the same price region in Steam, but still annoying.
Out of curiosity, what convenience? How is using Paypal easier than just inputting your card info once?