Once you buy mining equipment for a specific hashing algorithm the cost is paid for all future chains which implement that algorithm. Comparatively speaking this is rather cheap for a company which can simply specialize in creating the ASICs in a place such as China. Also, computing power is not something high tech countries lack, so this favors high tech countries with cheap electricity.

Mining farms, mining pools or more clandestine mining organizations, may already control multiple Proof of Work chains already.

The main problem of staking is that its very easy to stake on multiple chains, and to have multiple competitive chain without a good objective manner to objectively decide which one is the best one.

That is the problem with Proof of Work but the difference is you have to spend the money for each chain. You can't avoid buying into each chain to get a stake in each chain with Proof of Stake. In mining once you have your mining farm you can use it on multiple chains which use the same algorithm. If the mining farm is CPU based then you can use your CPUs. If necessary you can even use a botnet to mine clandestinely in the background without any way to track who is doing it.

Proof of Work does indeed reward botnets and underground mining groups.

But to me all coin as they are made will lead to centralization, pos coin are generally launched with ico because there cant be an easy way to distribute coin fairly, and always end up oligarchy.

Centralization in terms of some holders having a bigger stake than others does exist but those holders also are taking more risk than others. In essence we can trust them because they have more to lose as well as more to gain. In POW the miners can simply mine another chain and have nothing to lose if Litecoin goes extinct.