The truth is that shitcoins such as ETH have massive premines (72 million Ether to be exact) and are centralized. The centralized authority wants to take advantage of the "get paid jut because you own something" feature of PoS and switch to it. They are also aware that their shitcoin is losing its hype and slowly miners are leaving it behind specially as it dumps and mining becomes less and less profitable and in PoW when you lose miners you lose security and soon enough these shitcoins will be filled with 51% attacks every day.

So they sell PoS as a "solution" to their naive users by using fake arguments such as "low electricity cost" while ignoring all the serious flaws in PoS.

You already answered your own question, the keyword was "many" (although it is only some countries). Miners will migrate to places where they can freely and cheaply mine and there are many countries with very low electricity cost, low tax, cheap labor, better climate and are friendly to bitcoin.