Article is based on views of Andreas Antonopoulos but did not cover all points
Edit: Adding below the views of Andreas Antonopoulos
https://www.youtube.com/watch?v=KSv0J4bfBCc&feature=push-u&attr_tag=GUmiDnU0TxDaahFh%3A6&ab_channel=aantonop
The main points from his video
1.When you own Bitcoin you own keys. You are in control of your Bitcoin. By ETF , you will not have any keys so you are not in control of your Bitcoin.
2.ETF owner/Custodian will be a single holder of the Bitcoin. ETF holding so large amount of Bitcoin can easily manipulate the market.
3.If any debate going to happen in bitcoin (like Bitcoin cash ) in future then ETF custodian will have the voice but not the actual share holders.
4.Bitcoin ETF is a terrible idea but it might happen in future.
Actually Mr. Antonopoulos view is based on assumption that commodity market can be manipulated. I have no idea how true this statement is.
I guess every country took some measure so that market cannot be manipulated and it is a punishable offence.