My one changed from charge card to interest bearing - it is now 704.6% interest rate, so it is still a charge card!

What country is that in?

UK

To add to this as well, this can be disabled, but it's on by default for new applicants. They can put a limit on the charge cards as well, so it can be almost an ambiguously limited credit card now. That said, I don't think being given a set limit is very common, or very impactful for the average person unless you're a large spender.

Not all charges can be PoT'd, though. In general you still have to pay the entire statement balance each billing cycle (it's a good habit to have when using credit cards anyway).

Pay over Time is only for "eligible" charges, not the entire balance.

I have yet to see a charge on my Amex Platinum that wasn't eligible for pay over time. In practice, I would say it's not different from another credit card at this point.

I believe each transaction has to be over $100 and there's a total limit on the number of pay over time plans you can have active. But yes, other than the dollar amount, I've not seen anything not be eligible.