You are in the right discussion to read the hundreds of identical messages and that there is only the change of motherboard as a solution, that the price of the replacement is equivalent to a gamer phone from other brands and that the new motherboard will have a duration as short as the original.
If you bought it without going through the official ASUS dealers in your country, there are many solutions, the best in my opinion is to buy a good hammer (it will serve for many years) and organize a Fury Room game, or even to create a company, it is a market in full expansion and the ASUS rog phone 5 clientele is assured
Some links at the bottom of the message
If you bought it through the official circuit of your country, write to ASUS, ask for support, extract the hundreds of similar cases to support your request, go through a consumer association, in short, consider all possible remedies.
https://www.youtube.com/watch?v=-f7z017ONtohttps://lille.citycrunch.fr/2022/03/16/on-a-teste-le-defouloir-casse-auto-lille/https://www.karnage-club.fr/groupes/formules-groupe-evg-evjf/