So this topic was inspired by this person.
The original definition of "decentralized" in the context of Bitcoin was a network that could not be easily controlled by the US government because there was no central legal entity or small group of entities to prosecute.
By that definition, Bitcoin is no longer decentralized.
First off, what is bitcoin ETFs? A Bitcoin ETF is a financial product that tracks Bitcoin's price and trades on traditional stock exchanges. Instead of buying and holding actual Bitcoin you buy shares of the ETF through a normal broker just like buying company stocks.
Bitcoin as we know it is decentralised. Good. Also, it is also accessible to everyone. We all know that. Now institutions created Bitcoin ETFs because they couldn't directly own bitcoin. The problem now is that a lot of people are actually buying these ETFs rather than buying bitcoin directly. Of which these institutions are under the US. The US has indirectly taken control of the road used to access bitcoin. Controlling how to get bitcoin still holds great power as the protocol itself.
The main question is why would people take that route knowing fully well or maybe they don't that bitcoin aims for decentralisation and buying Bitcoin ETFs defeats that notion.