Foster services aren't underserved because a lack of humans to do it, it's underserved because of a lack of interest in funding it. If 100 million goes to US fostering bureaucracy annually, and this proposed model of ChatGPT can do what you suggest at a 10th of the cost, then the budget will simply go down to 10 million.

Not even touching the myriad number of 'ifs' involved, not least witch is the propensity for automated systems to disproportionately marginalize minority and poor people.