You have to clear credit checks to get a credit card. Theres also generally a more involved application process (at least a little bit). The added barriers helped prevent the most financially unstable people from getting them.
There's plenty of problems with the system, but at least it's more difficult for people to get preyed on by credit card companies.
I see these companies like Klarna as not any better then payday loan places.
Predatory lending is a specific kind of targeted, exploitative lending. The form it takes is irrelevant (See below). And 2 wrongs don't make a right, but 3 lefts do.
Having a credit card allowed me to cancel my non-savings account and not pay bank fees. I use my credit card to pay for everything and then pay the credit card from my savings account. They are so dumb lol.
As the post to which you replied did, without needless judgement: