Which Proof of Stake coins are you unable to Acquire?
All of them, without permission from an existing stakeholder (hacking exception from previous post noted)
You can go to an exchange and buy some, instead of making up stories.
If BTC owners don't sell their coins , you can't buy them either, so your Logic is Flawed.

You act like people are sealed in a bubble, fact is there is always something someone else has, that someone else wants, and to get those services & goods, we must trade with each other. IE: Food , Water , Healthcare, Companionship, Entertainment , New Cars, all of this require you give something up, the idea that someone can live without trading anything is beyond fantasy.
Because you still have to buy the asics or cloud mining from someone, so without their permission, you can't get BTC.

In other words you have to get permission from the ISP, Hardware Manufacturers, and electric company , before you can even attempt mining,
so this permission verses permission less theory is really just a load a BS.
So the world has to conspire to take away electricity (that can be used for anything), hardware (that can be used for anything) and ISP (which can be used for anything) in order for POW to be equally permission-based as a POS coin? WTF, dude.