I'll duplicate what was added to the posted thread :) The AI Image Enhancer is also an upscaler, and takes up to 2K as input, but gives up to 4K as results.
Right now there are no plans for it to become a credit / money thing one day. OFC plans can change, but there's nothing on the cards for that right now. It's also been out for Enscape for close to a year, without it going "pay to win" ;)