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.