Let me try answering the questions.
1. Do you want large institutional financial organisations buying large amounts of bitcoins and then locking it up in centralized trading platforms?
My opinion is irrelevant. If another person wants to lock their bitcoin in a centralized platform, then who am I to tell him do otherwise? I'd rather want from the overwhelming majority to respect self-custody, but it is part of the Bitcoin spirit to respect freedom of choice as well.
2. Do you want Bitcoin to be a commodity or a currency? ETFs will destroy the goal of Bitcoin becoming a currency.
Again, what I want is irrelevant. However, if my opinion holds even the slightest value, I prefer to allow each individual to determine for themselves the optimal perspective on Bitcoin. ETFs will definitely not destroy Bitcoin as currency, same as with any other centralized platform.
The following quoted sentences are not questions, so I guess I have to comment them.
3. ETFs take direct investment capital into personal ownership of Bitcoin away and it pulls that capital into centralized trading platforms. (Those coins are owned by the trading platform, because they control the private keys)
As it already happens with centralized exchanges.
4. Fiat whales get control over bitcoins and can be used to manipulate the Bitcoin price. (They control the traditional Fiat investment options, so they will gradually increase their ownership of bitcoins to control that too)
As it already happens.
5. ETFs destroy pseudo anonymity, because it is highly regulated with strict KYC requirements implemented to identify every trader on their platform.
Pseudo-anonymity is the last thing an investor will look when buying an ETF. Nonetheless, it won't affect Bitcoin's pseudo-anonymity in the slightest.
6. Bitcoin's future success rely on actual coins being transfered on the Blockchain, because it generates miners fees to reward the miners. What happens when the Block reward falls away and not enough transaction happen, because bitcoins are locked up in ETFs.
The Bitcoin network has long been congested without any ETFs. We've been at 30-100 sat/vb months now, before ETF was approved. There are countless of reasons why there will be on-chain transactions.