You write that the GPU is harder to find in shops/online. It's not true. All retailers and secondary market are overloaded with video cards.
I think that the CryptoNight algorithm has nothing to do with the CPU. If it becomes profitable, there will immediately come a lot of GPUs.
Most coins from 1 post are decentralized digital money. It is based on CryptoNote anonymous technology. It is forks monero or coins with a similar idea and technology. And to mine them on the CPU hoping for a pamp like a game of roulette

The only chance to make money on the CPU is to find new coins on algorithms where there is no GPU.
Most GPU miners are not profitable if you have to pay $0.15/kWh. So there is a overload of GPU now.