"Gas costs €35 per mwh for delivery today, but €110 for a guaranteed shipment in December and €142 for one in February, once heaters turn on."
The market is in contago, if you can find a way to store the gas you can make money buying today and delivering in Dec/Jan/Feb.
You could even take delivery in December if you can find storage and sell in Feb and lock in a spread of $32 today. This is the reason you're seeing so many LNG ships outside the coast of western Europe.
Think of it this way, if another company announces they're planning to buy a publicly traded company, what happens to the value of the shares?
The price goes up, you've just made it more expensive for yourself to take over the network.
If you were to attempt to take over you'd be better to do so in silence. However, it would be hard to hide that kind of control and wealth when every information on the network is publicly available.
Computing power is just a proxy for capital/resources. Why not be more efficient and use the capital directly and save power in the meanwhile.
Current market cap of ETH is ~$324B, thus getting 50.1% of ETH would require $162.3B in capital. However, as soon as you start acquiring ETH the price will increase, especially at those large volumes.
It would be insanely hard to come up with enough resources to buy enough ETH in a POS world to take over the network. Never mind the fact that as soon as it's become evident you've taken over the network the value of the network is essentially worthless and you've just destroyed billions of dollars worth of capital in the process.