...I have to say that I had never heard of having to pay a premium for port forwarding capabilities, but I reckon that nowadays ISPs are always looking for ways to charge customers functions that should be made available freely....
So there is no port forwarding since you are more or less already on a 'private network' Some ISPs are dong a hybrid with your IP4 address coming through CGNAT but you also get a real pubic IP6 address that you can use.
So, yeah it's happening. Starlink is a prime example of this people ran out to get it and then discovered a bunch of things that need static port mappings no longer work.