Bitcoin is not all the same.
If you own the ETFs you don't actually own the bitcoin.
You own an IOU on that bitcoin.
A paper bitcoin if you will, though it can't be replicated.
(Source: https://twitter.com/unchainedcom/status/1770910947432890577/photo/1)
Owning bitcoin carries risks though.
You can lose your bitcoin and then lose your bitcoin.
If you own the paper you have insurance.